Protection has been heightened for the three judges who ruled to maintain a block against President Trump's ordered travel ban.

CNN reports that the severity of the threats is unknown, but local police and the U.S. Marshals services have stepped up security.

The U.S. Marshal's service did not discuss the security measures taken, but said that they "take appropriate steps to provide additional protection when it is warranted."

As the nation awaits next moves from the White House in response to the court's controversial ruling, here is a look at the judges who served on the three-person panel.

RELATED: Trump advocates show support for immigration ban



14 PHOTOS Trump advocates show support for travel ban See Gallery Trump advocates show support for travel ban Demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Pro-Trump demonstrators yell slogans during protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Los Angeles International Airport in Los Angeles, California, U.S., January 29, 2017. REUTERS/Ted Soqui A counter demonstrator holds a sign up as protesters gather in Battery Park and march to the offices of Customs and Border Patrol in Manhattan to protest President Trump's Executive order imposing controls on travelers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen, January 29, 2017 in New York. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images) Demonstrators watch from an overpass as a counter-protester holds a sign outside Los Angeles International Airport (LAX) during a protest against U.S. President Donald Trump's executive order blocking visitors from seven predominantly Muslim nations in Los Angeles, California, U.S., on Sunday, Jan. 29, 2017. Court decisions temporarily blocked the U.S. administration from enforcing parts of Trump's order after a day in which students, refugees and dual citizens were stuck overseas or detained and some businesses warned employees from those countries not to risk leaving the United States. Photographer: Dania Maxwell/Bloomberg via Getty Images A counter-protester, right, holds a sign and chants in front of other demonstrators outside Los Angeles International Airport (LAX) protesting against U.S. President Donald Trump's executive order blocking visitors from seven predominantly Muslim nations in Los Angeles, California, U.S., on Sunday, Jan. 29, 2017. Court decisions temporarily blocked the U.S. administration from enforcing parts of Trump's order after a day in which students, refugees and dual citizens were stuck overseas or detained and some businesses warned employees from those countries not to risk leaving the United States. Photographer: Dania Maxwell/Bloomberg via Getty Images Demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) A demonstrator in support of the immigration rules implemented by U.S. President Donald Trump's administration, rallies at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Police officers stand guard as demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Demonstrators in support of the immigration rules implemented by U.S. President Donald Trump's administration, rally at Los Angeles international airport in Los Angeles, California, U.S., February 4, 2017. (REUTERS/Ringo Chiu) Trump supporters demonstrate against a ruling by a federal judge in Seattle that grants a nationwide temporary restraining order against the presidential order to ban travel to the United States from seven Muslim-majority countries, at Tom Bradley International Terminal at Los Angeles International Airport on February 4, 2017 in Los Angeles, California. (Photo by David McNew/Getty Images) Arriving international travelers pass through a line of Trump supporters demonstrating against a ruling by a federal judge in Seattle that grants a nationwide temporary restraining order against the presidential order to ban travel to the United States from seven Muslim-majority countries, at Tom Bradley International Terminal at Los Angeles International Airport on February 4, 2017 in Los Angeles, California. (Photo by David McNew/Getty Images) Trump supporters argue with a man (R) who supports a ruling by a federal judge in Seattle that grants a nationwide temporary restraining order against the presidential order to ban travel to the United States from seven Muslim-majority countries, at Tom Bradley International Terminal at Los Angeles International Airport on February 4, 2017 in Los Angeles, California. (Photo by David McNew/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Judge William C. Canby Jr., appointed by President Jimmy Carter

Canby earned his undergraduate degree from Yale University in 1953, and later graduated from University of Minnesota Law School. The former JAG Corps lieutenant and Peace Corps professional later served as professor at Arizona State University, known for his authority on American Indian law.

Canby has presided over a number of crucial rulings throughout his career. A 1995 Canby ruling determined the Brady Handgun Violence Prevention Act -- which required local and state law enforcement officials to conduct background checks of handgun buyers -- was not in violation of the Tenth Amendment. The ruling was later reversed, though in the Supreme Court's decision in Printz v. United States.

In 2001, Canby wrote a unanimous panel decision holding that the Americans with Disabilities Act required the Professional Golfers Association to allow disabled golfer Casey Martin to use a golf cart when competing. The opinion was later affirmed by the Supreme Court.

Canby currently presides as a senior judge on the United States Court of Appeals for the Ninth Circuit, sitting in Phoenix, Arizona.

Judge Richard R. Clifton, appointed by President George W. Bush

Judge Richard Clifton was President George W. Bush's first appointment to the Ninth Circuit, nominated on Sept. 4, 2001.

Clifton received his undergraduate degree from Princeton University before graduating from Yale Law School. He clerked for Ninth Circuit Judge Herbert Choy upon graduation.

He then practiced privately in Hawaii before he was appointed to the federal bench. He notably served as one of the panel judges who upheld the imprisonment of Josh Wolf in 2006.

RELATED: Protests erupt throughout US cities over Trump immigration ban



33 PHOTOS Protests erupt throughout US cities over Trump immigration ban See Gallery Protests erupt throughout US cities over Trump immigration ban Demonstrators gather in Copley Square for the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder An international traveler smiles as she walks past the protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman Demonstrators yell slogans during protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Los Angeles International Airport in Los Angeles, California, U.S., January 29, 2017. REUTERS/Ted Soqui Sarah Ijaz joins the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder BOSTON - JANUARY 29: People hold signs as they march from Copley Square to the Mass. State House in Boston on Jan. 29, 2017, to protest President Donald Trump's executive order banning people from several predominantly Muslim countries from entering the country. (Photo by Jessica Rinaldi/The Boston Globe via Getty Images) Muslim women pray during the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" protesting U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder People gather to pray in baggage claim during a protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman Eight year-old Esma, an Irish-Moroccan-American, prays with other Muslim women during the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" protesting U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Demonstrators spell out "# No Muslim Ban" during the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Izzy Berdan (R) joins the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Muslim women pray during the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" protesting U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Muslim women pray during the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" protesting U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Demonstrators gather in Copley Square for the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder An activist holds a sign outside the White House to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Activists gather outside the White House to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Activists gather outside the White House to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Activists gather outside the White House to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Samah Mansur, from Egypt, takes part in the "Boston Protest Against Muslim Ban and Anti-Immigration Orders" to protest U.S. President Donald Trump's executive order travel ban in Boston, Massachusetts, U.S. January 29, 2017. REUTERS/Brian Snyder Activists gather outside the White House to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein People gather to protest against the travel ban imposed by U.S. President Donald Trump's executive order, at First Baptist Church in Dallas, Texas, U.S., January 29, 2017. REUTERS/Laura Buckman BOSTON - JANUARY 29: People hold signs as they gather in Copley Square in Boston on Jan. 29, 2017, to protest President Donald Trump's executive order banning people from several predominantly Muslim countries from entering the country. (Photo by Jessica Rinaldi/The Boston Globe via Getty Images) BOSTON - JANUARY 29: People gather in Copley Square in Boston on Jan. 29, 2017, to protest President Donald Trump's executive order banning people from several predominantly Muslim countries from entering the country. (Photo by Jessica Rinaldi/The Boston Globe via Getty Images) UNITED STATES - JANUARY 29: Rep. Don Beyer, D-Va., speaks with an ACLU legal observer during the protest at Dulles International Airport in Virginia on Sunday, Jan. 29, 2017. Protests erupted at airports around the country following President Trump's executive order restricting travel from several Islamic countries. (Photo By Bill Clark/CQ Roll Call) MIAMI, FL - JANUARY 29: A protester holds up a sign that reads, 'Banning Immigrants is UnAmerican!,' as she stands with others at the Miami International Airport against the executive order that President Donald Trump signed clamping down on refugee admissions and temporarily restricting travelers from seven predominantly Muslim countries on January 29, 2017 in Miami, Florida. Demonstrators gathered at airports across the country in protest of the order. (Photo by Joe Raedle/Getty Images) MIAMI, FL - JANUARY 29: Protesters stand together at the Miami International Airport against the executive order that President Donald Trump signed clamping down on refugee admissions and temporarily restricting travelers from seven predominantly Muslim countries on January 29, 2017 in Miami, Florida. Demonstrators gathered at airports across the country in protest of the order. (Photo by Joe Raedle/Getty Images) MIAMI, FL - JANUARY 29: Susan Barimo joins with other protesters as they stand together at the Miami International Airport against the executive order that President Donald Trump signed clamping down on refugee admissions and temporarily restricting travelers from seven predominantly Muslim countries on January 29, 2017 in Miami, Florida. Demonstrators gathered at airports across the country in protest of the order. (Photo by Joe Raedle/Getty Images) People gather outside Terminal 4 during a protest against Donald Trump's travel ban at John F. Kennedy International Airport in Queens, New York, U.S., January 29, 2017. REUTERS/Andrew Kelly International travelers walk past protestors holding signs as they protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman Protesters at Discovery Green Park during Super Bowl events in Houston, Texas, U.S., January 29, 2017. REUTERS/Trish Badger Dozens of pro-immigration demonstrators cheer and hold sign as international passengers arrive at Dulles International Airport, to protest President Donald Trump's executive order baring visitors, refugees and immigrants from certain countries to the United States, in Chantilly, Virginia, in suburban Washington, U.S., January 29, 2017. REUTERS/Mike Theiler Activists march to the US Capitol to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein TPX IMAGES OF THE DAY Activists march to the US Capitol to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Activists gather at the US Capitol to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Judge Michelle T. Friedland, appointed by President Barack Obama​​

Friedland is the most recently appointed panel judge, picked by President Obama on August 1, 2013. She received both her B.S. and J.D. from Stanford University, before notably serving as a law clerk to Supreme Court Justice Sandra Day O'Connor.

Before her confirmation, Friedland served as a litigation partner in the San Francisco office of Munger, Tolles & Olson LLP. During her legal career, Friedland represented a number of corporate clients in cases involving a wide range of legal issues, including antitrust, tax, patent, copyright, and consumer class actions. She also frequently represented the University of California in cases involving constitutional issues.

Although the president's verbal assaults on judges have drawn criticism, experts say his comments were not meant to put judges in danger.

"What he is doing is criticizing a judge for what he believes to be a failure to follow the law properly," Trump adviser Leonard Leo said about the President's remarks.

Trump has said he plans to appeal the court's decision to uphold the block on his travel ban and will be speaking with new Attorney General Jeff Sessions about the issue.

Josh King contributed to this report

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