WASHINGTON (AP) — The government’s top infectious disease expert said Sunday he would like to see aggressive measures such as a 14-day national shutdown that would require Americans to hunker down even more to help slow spread of the coronavirus.

Still, Dr. Anthony Fauci said travel restrictions within the United States, such as to and from hard-hit Washington state and California, probably will not be needed anytime soon.

Fauci, the public face of the administration's messaging during a round of morning TV interviews, said the country should do as much as “we possibly could,” even if officials are criticized for “overreacting.” He said he raised the issue of measures such as a shutdown with the Trump administration, and said it has been open to his ideas.

“I think Americans should be prepared that they are going to have to hunker down significantly more than we as a country are doing,” said Fauci, a member of the White House task force on combating the spread of coronavirus. He heads the National Institute of Allergy and Infectious Diseases at the National Institutes of Health.

Fauci said the elderly and those with underlying medical conditions should already be hunkering down, but other Americans, too, should consider “much more” restrictions on outside activity, from work and travel to possibly eating at restaurants.

“Everybody has got to get involved in distancing themselves socially,” Fauci said.

“Everything is on the table,” he said. “Right now, myself personally, I wouldn't go to a restaurant. I just wouldn't because I don't want to be in a crowded place. ... I don't want to be in a situation where I’m going to be all of a sudden self-isolating for 14 days.” The virus has an incubation period of anywhere from two days to 14 days before symptoms emerge.

For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia. The worldwide outbreak has sickened more than 156,000 people and left more than 5,800 dead. The death toll in the United States has reached more than 50, while infections neared 3,000 across 49 states and the District of Columbia.

The vast majority of people recover. According to the World Health Organization, people with mild illness recover in about two weeks, while those with more severe illness may take three weeks to six weeks to recover.

President Donald Trump last week announced a sweeping travel ban for much of Europe. On Saturday, he added the United Kingdom and Ireland to a list of countries that would face travel restrictions over the next 30 days. The State Department on Sunday said it would allow U.S. personnel to leave their diplomatic or consular posts worldwide if they or family members were medically determined to be at a higher risk of falling very ill if exposed to the virus.

Trump also has pledged broadened U.S. testing for the virus as major employers such as Apple Inc. have sent workers home to telework and several states and big cities, including Los Angeles and Boston, shuttered down schools for a week or more.

39 PHOTOS Coronavirus outbreak in the U.S. See Gallery Coronavirus outbreak in the U.S. Vice President Mike Pence points to a question as he speaks during a briefing about the coronavirus in the James Brady Press Briefing Room of the White House, Sunday, March 15, 2020, in Washington. (AP Photo/Alex Brandon) Tyler Baldwin mops the floor after closing for the night at the Taproom at Pike Place, Sunday, March 15, 2020 where he works as a bartender in Seattle. Washington Gov. Jay Inslee said Sunday night that he would order all bars, restaurants, entertainment and recreation facilities in the state to temporarily close to fight the spread of coronavirus, as Washington state has by far the most deaths in the U.S. from the disease. Baldwin said he closed more than an hour early Sunday after he heard the announcement. (AP Photo/Ted S. Warren) A freeway sign urging people to wash their hands to avoid the COVID-19 virus is seen along the 101 Ventura freeway Sunday, March 15, 2020, in Westlake Village, Calif. (AP Photo/Mark J. Terrill) Shelves are emptied of paper toilet and product supplies at a Safeway store in Phoenix on Sunday, March 15, 2020. Arizona's governor and school superintendent on Sunday ordered a statewide closure of schools through at least March 27 as authorities rush to contain the outbreak of the new coronavirus. (AP Photo/Brian Skoloff) A store vendor wears a face mask as she waits for customers in Chinatown in New York, on Sunday, March 15, 2020. President Donald Trump on Sunday called on Americans to cease hoarding groceries and other supplies, while one of the nation's most senior public health officials called on the nation to act with more urgency to safeguard their health as the coronavirus outbreak continued to spread across the United States.(AP Photo/Wong Maye-E) Workers from a Servpro disaster recovery team wearing protective suits and respirators are given supplies as they line up before entering the Life Care Center in Kirkland, Wash., to begin cleaning and disinfecting the facility, Wednesday, March 11, 2020. The nursing home is at the center of the coronavirus outbreak in Washington state. For most people, the virus causes only mild or moderate symptoms. For some it can cause more severe illness, especially in older adults and people with existing health problems. (AP Photo/Ted S. Warren) March 11th 2020 - Tom Hanks and Rita Wilson have tested positive for the novel coronavirus. - File Photo by: zz/KGC-11/STAR MAX/IPx 2016 9/9/16 Tom Hanks and Rita Wilson at The 5th Biennial Stand Up To Cancer (SU2C). (Los Angeles, CA) NBA referee Marc Davis, left, takes a phone call as fellow referee Justin Van Duyne stands next to Davis before the basketball game between the New Orleans Pelicans and Sacramento Kings was postponed at the last minute in Sacramento, Calif., Wednesday, March 11, 2020. The league said the decision was made out of an "abundance of caution," because official Courtney Kirkland, who was scheduled to work the game, had worked the Utah Jazz game earlier in the week. A player for the Jazz tested positive for the coronavirus. (AP Photo/Rich Pedroncelli) NBA referee Marc Davis leaves the court after the the NBA basketball game between the Sacramento Kings and the New Orleans Pelicans was postponed at the last minute in Sacramento, Calif., Wednesday, March 11, 2020. The postponement was due to what the league said was an "abundance of caution," because official Courtney Kirkland, who was scheduled to work the game, had worked the Utah Jazz game earlier in the week. A player for the Jazz tested positive for the coronavirus. (AP Photo/Rich Pedroncelli) From left Ellie Unruh, Abbie Unruh, Zoe Yates, and Evi Yates bump elbows instead of high-fives while playing volleyball at a local park Sunday, March 15, 2020, in Gilbert, Ariz. The girls were playing with friends after their respective volleyball clubs and teams practices and games were canceled statewide due to the COVID-19 coronavirus. Arizona Gov. Doug Ducey announced earlier in the day that all schools and sports throughout Arizona are temporarily closed through March 27th challenging some parents to get creative in keeping their kids active. (AP Photo/Matt York) A basketball fan walks past a sign on how to decrease the risk of catching the coronavirus outside a restroom at the American Airlines Arena during the first half of an NBA basketball game between the Miami Heat and the Charlotte Hornets, Wednesday, March 11, 2020, in Miami. (AP Photo/Wilfredo Lee) President Donald Trump speaks in an address to the nation from the Oval Office at the White House about the coronavirus Wednesday, March, 11, 2020, in Washington. (Doug Mills/The New York Times via AP, Pool) FILE PHOTO: Voters cast their ballot in the Democratic primary election in Houston A trader works on the floor at the New York Stock Exchange (NYSE) in New York City, New York Judie Shape, left, who has tested positive for the coronavirus, waves to her daughter, Lori Spencer, right, Wednesday, March 11, 2020, as they visit on the phone and look at each other through a window at the Life Care Center in Kirkland, Wash., near Seattle. In-person visits are not allowed at the nursing home. The vast majority of people recover from the new coronavirus. According to the World Health Organization, most people recover in about two to six weeks, depending on the severity of the illness. (AP Photo/Ted S. Warren) Judie Shape, center, who has tested positive for the coronavirus, blows a kiss to her son-in-law, Michael Spencer, left, as Shape's daughter, Lori Spencer, right, looks on, Wednesday, March 11, 2020, as they visit on the phone and look at each other through a window at the Life Care Center in Kirkland, Wash., near Seattle. In-person visits are not allowed at the nursing home. The vast majority of people recover from the new coronavirus. According to the World Health Organization, most people recover in about two to six weeks, depending on the severity of the illness. (AP Photo/Ted S. Warren) As President Donald Trump listens, Vice President Mike Pence speaks in the briefing room of the White House in Washington, Monday, March, 9, 2020, about the coronavirus outbreak. (AP Photo/Carolyn Kaster) Yirmeyahu Gourarie performs a Purim reading from the Book of Esther for residents under self-quarantine due to potential exposure to the new coronavirus, Monday, March 9, 2020, in New Rochelle, N.Y. In Westchester County, student volunteers from a Jewish secondary school were fanning out in teams to read the megillah on Monday evening and during the day Tuesday outside the homes of about 120 families from the community who are quarantined. (AP Photo/John Minchillo) This March 9, 2020, image provided by Carolyn Wright, a passenger aboard the Grand Princess, shows the disembarkation of the passengers from the cruise ship which is docked in Oakland, Ca. For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia. (Courtesy of Carolyn Wright via AP) Tim Killian, center, a spokesman for Life Care Center in Kirkland, Wash., talks to reporters, Monday, March 9, 2020, at the facility near Seattle. The nursing home is at the center of the outbreak of COVID-19 in Washington state. (AP Photo/Ted S. Warren) A sign stands next to a sanitizing station at the entrance of the Vivint Smart Home Arena before an NBA basketball game between the Toronto Raptors and the Utah Jazz, Monday, March 9, 2020, in Salt Lake City. (AP Photo/Rick Bowmer) Workers prepare a wharf at the Port of Oakland to receive the Grand Princess in Oakland, Calif., Sunday, March 8, 2020. The cruise ship, miles off the port Sunday, is expected to dock Monday for novel coronavirus quarantine after multiple people tested positive for the virus. (AP Photo/Noah Berger) En esta imagen tomada de un video cortesía de la Guardia Nacional de California, un helicóptero del 129no batallón de rescate sobrevuela el crucero Gran Princess frente a las costas de California, el jueves 5 de marzo de 2020. (Guardia Nacional de California vía AP) In this image from video, provided by the California National Guard, airmen with the 129th Rescue Wing drop virus testing kits down to the Grand Princess cruise ship off the coast of California Thursday, March 5, 2020. Scrambling to keep the coronavirus at bay, officials ordered a cruise ship with 3,500 people aboard to stay back from the California coast Thursday until passengers and crew can be tested, after a traveler from its previous voyage died of the disease and at least two others became infected. The California National Guard 129th Rescue Wing lowered test kits onto the 951-foot (290-meter) Grand Princess by rope as the vessel lay at anchor off Northern California, and authorities said the results would be available on Friday. Princess Cruise Lines said fewer than 100 people aboard had been identified for testing. (California National Guard via AP) Passengers look out from balconies aboard the Grand Princess as it cruises a holding pattern about 25 miles off the coast of San Francisco on Sunday, March 8, 2020. The ship is expected to dock in Oakland in the east San Francisco Bay on Monday. California Gov. Gavin Newsom and the mayor of Oakland sought Sunday to reassure the public that none of the passengers from the ship with multiple cases of the new coronavirus will be released into the public before undergoing a 14-day quarantine. (AP Photo/Noah Berger) Carrying multiple people who have tested positive for COVID-19, the Grand Princess maintains a holding pattern about 30 miles off the coast of San Francisco, Sunday, March 8, 2020. The cruise ship is scheduled to dock at the Port of Oakland on Monday. (AP Photo/Noah Berger) A man wears a mask aboard the Grand Princess as it maintains a holding pattern about 25 miles off the coast of San Francisco on Sunday, March 8, 2020. The cruise ship is scheduled to dock at the Port of Oakland on Monday for COVID-19 quarantine after 21 people tested positive for the virus. (AP Photo/Noah Berger) SPRINGFIELD, VA - MARCH 7: Local Target store in the D.C area depleted of cleaning and sanitizing supplies and left with empty shelves as fear grow of COVID-19 (the coronavirus) reports increasing on March 7, 2020 in Springfield, Virginia. Credit: mpi34/MediaPunch /IPX SPRINGFIELD, VA - MARCH 7: Local Target store in the D.C area depleted of cleaning and sanitizing supplies and left with empty shelves as fear grow of COVID-19 (the coronavirus) reports increasing on March 7, 2020 in Springfield, Virginia. Credit: mpi34/MediaPunch /IPX The headquarters for Centers for Disease Control and Prevention is shown on Friday, March 6, 2020 in Atlanta, Georgia. President Donald Trump's trip to the Centers for Disease Control and Prevention, briefly scuttled Friday because of unfounded fears that someone there had contracted the coronavirus, was back on, giving the president another chance to calm growing alarm about the spread of the virus in America. (AP Photo/ Ron Harris) An ambulance backs into a parking lot, Friday, March 6, 2020, at the Life Care Center in Kirkland, Wash., which has become the epicenter of the COVID-19 coronavirus outbreak in Washington state. This ambulance left the facility after a short time and did not transport a patient. (AP Photo/Ted S. Warren) Ambulance workers move a man on a stretcher from the Life Care Center in Kirkland, Wash. into an ambulance, Friday, March 6, 2020. The facility is the epicenter of the outbreak of the the COVID-19 coronavirus in Washington state. (AP Photo/Ted S. Warren) A woman uses protective gloves as she looks at her phone wrapped in a plastic bag while riding a New York City subway train, Monday, March 9, 2020. (AP Photo/Richard Drew) Secretary of Health and Human Services Alex Azar looks on as President Donald Trump shows a spending bill to combat the Coronavirus, at the White House, Friday, March 6, 2020, in Washington. (AP Photo/Evan Vucci) President Donald Trump holds a photograph of coronavirus as Dr. Steve Monroe,right, with CDC speaks to members of the press at the headquarters of the Centers for Disease Control and Prevention in Atlanta on Friday, March 6, 2020. President Trump's trip to the Centers for Disease Control and Prevention, briefly scuttled Friday because of unfounded fears that someone there had contracted the coronavirus, was back on, giving the president another chance to calm growing alarm about the spread of the virus in America. (Hyosub Shin/Atlanta Journal-Constitution via AP) Photo by: John Nacion/STAR MAX/IPx 2020 3/6/20 People wear masks to protect themselves from the Corona Virus in New York City. Photo by: John Nacion/STAR MAX/IPx 2020 3/6/20 People wear masks to protect themselves from the Corona Virus in New York City. Shoppers have cleared store shelves of sanitizing products. Vice President Mike Pence, left, arrives with Debi Birx, center, White House coronavirus response coordinator, and Robert Redfield, right, director of the CDC, Thursday, March 5, 2020, at Joint Base Lewis-McChord in Washington state for a visit with state officials. (AP Photo/Ted S. Warren) Vice President Mike Pence greets Washington Gov. Jay Inslee, left, as Pence arrives, Thursday, March 5, 2020 at Joint Base Lewis-McChord in Washington state. Officials are avoiding handshakes due to the COVID-19 coronavirus. (AP Photo/Ted S. Warren) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

In the nation's capital, White House officials said Trump tested negative for the virus over the weekend after he was recently in contact with three people at his Florida resort who tested positive, and several lawmakers in recent days have said they were self-quarantining out of an abundance of caution.

House Speaker Nancy Pelosi, D-Calif., said Congress has started work on a new aid package after the one just approved by the House early Saturday. The new one would provide direct relief to Americans suffering physically, financially and emotionally from the coronavirus pandemic.

“We have already begun work to develop a third emergency response package,” Pelosi wrote in a letter to colleagues.

With the U.S. Capitol among the many iconic landmarks closed to tours, Pelosi also urged lawmakers to have most of their Washington staff telework from home, as health officials urge social distancing. House lawmakers are away on weeklong recess and many have already curtailed office visits at their local offices, as well.

Democratic Rep. Adam Schiff, chairman of the House Intelligence Committee, on Sunday said a former staff member tested positive for the virus. The staffer, Daniel Goldman, the attorney who led Democratic questioning during the House impeachment hearings, had left the office 10 days ago and he's believed to have contracted the virus after his departure.

“We will still be taking additional precautions over the next few days,” Schiff said. “The former staffer is feeling better and no current staff have reported any flu-like symptoms at this time.”

NIH reported Sunday that one of its staff working in its division on arthritis and musculoskeletal and skin diseases had tested positive for COVID-19, its first case. NIH said the person was not involved in patient care and was now quarantined at home and "doing well.”

Trump has suggested that restrictions on travel within the U.S. to areas hit hard by the coronavirus pandemic could be next. But Fauci on Sunday played down that or having major national lockdowns on the level now seen in European countries such as Italy and Spain.

“We feel that with rather stringent mitigation and containment, without necessarily complete lockdown, we would be able to prevent ourselves from getting to where, unfortunately, Italy is now,” Fauci said.

“With regard to domestic travel bans, we always talk about it, consider everything. But I can tell you that has not been seriously considered, doing travel bans in the country. ... I don't see that right now or in the immediate future.”

At the White House, Trump on Sunday held a call with more than two dozen grocery store and supply chain executives to discuss their response to coronavirus outbreak. Retailers have reported seeing a crush of shoppers flocking to stores to stock up on food and other essentials. Consumers have expressed frustration that some items — such as hand sanitizer and toilet paper — are becoming more difficult to find. During the call, Trump expressed appreciation for their work to ensure food stocks are “constantly available” so “Americans feel calm and safe when shelves are stocked with the items they need,” according to White House spokesman Judd Deere.

“Supply chains in the United States are strong, and it is unnecessary for the American public to hoard daily essentials,” Deere said.

Still, more than the crisis was on Trump's mind. He tweeted that he was considering a full pardon for Michael Flynn, his disgraced former national security adviser, and he directed barbs at a familiar target, Senate Democratic leader Chuck Schumer of New York.

White House economic adviser Larry Kudlow expressed confidence that supply lines such as food for stores will be largely unaffected by the virus outbreak.

“Most of America is still working," he said. "Factories are not shutting down across the country, at least not yet.”

Trump, who declared Sunday a National Day of Prayer, said he tuned in to the live stream from the Free Chapel, a Gainesville, Georgia evangelical church led by Jentezen Franklin.

“I am watching a great and beautiful service by Pastor Jentezen Franklin. Thank you!” Trump tweeted.

Vice President Mike Pence, who leads the White House task force, said he planned to disclose more details about a web site being developed by Verily, a subsidiary of Google’s parent company, that is being designed to help communities assess and direct Americans to sites conducting coronavirus screening.

Trump on Friday announced the imminent rollout of a website “facilitated” by Google that would guide users through a series of questions to determine whether they should be screened for the virus. The company, however, has said that the web site was in early stages of development and would be focused on the San Francisco Bay Area.

Fauci spoke on NBC’s “Meet the Press,” CNN’s “State of the Union,” ABC’s “This Week,” “Fox News Sunday,” and CBS’ “Face the Nation.” Kudlow appeared on CBS.

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Associated Press writers Lisa Mascaro and Mary Clare Jalonick contributed to this report.

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The Associated Press receives support for health and science coverage from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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