President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE said Wednesday that his administration would begin to reopen national parks as states relax restrictions meant to curb the spread of the coronavirus.

“Thanks to our significant progress against the invisible enemy, I am pleased to announce that in line with my administration’s guidelines for opening up America again we will begin to reopen our national parks and public lands for the American people to enjoy,” Trump said during a tree planting ceremony at the White House recognizing Earth Day.

The National Park Service (NPS) has closed many public sites across the country, in accordance with state and local authorities, to lessen the spread of the deadly virus, which has sickened more than 800,000 people in the U.S.

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The White House on Thursday unveiled guidelines to help states and counties formulate plans to begin relaxing coronavirus restrictions and reopen their economies. Several governors have since announced plans to allow some businesses to reopen in the coming weeks.

During his remarks Wednesday, Trump gestured to Secretary of the Interior David Bernhardt, who was among a small group of attendees, about a timeline for reopening parks. Bernhardt indicated the decisions would be made in conjunction with governors’ plans.

“You have a lot of land to open up, too. People are going to be very happy,” Trump said.

Bernhardt later tweeted that he would "gradually reopen our National Parks in a safe manner."

Details regarding plans for reopening specific parks will be provided in the coming days following guidance from the White House, according to an Interior Department official.

The Grand Canyon and Yellowstone are among the iconic parks that have closed to the public during the pandemic.

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But not all parks and facilities are closed. NPS says on its website that “outdoor spaces in some parks remain accessible to the public.”

The agency has said it is “modifying its operations on a park-by-park basis in accordance with the latest guidance from the Centers for Disease Control and Prevention (CDC) and state and local public health authorities.”

Critics have raised concerns that allowing crowds to gather at national parks may contribute to the spread of the virus. That concern was heightened last month after the administration decided to waive entrance fees at parks that were open.

Democratic lawmakers, park advocates and local officials were among those calling for certain parks to close during the outbreak.

Updated at 2:45 p.m.