Interior Secretary David Bernhardt faced renewed calls Tuesday to close down the National Park System in the face of the coronavirus pandemic, while at Grand Canyon National Park nerves were fraying among some workers who couldn't understand why the park remained open.

The National Park Service units of western Pennsylvania, which include Allegheny Portage Railroad National Historic Site, Flight 93 National Memorial, Fort Necessity National Battlefield, Friendship Hill National Historic Site and Johnstown Flood National Memorial, are offering weekly Facebook Live videos featuring each park unit starting March 31.

Cumberland Gap National Historical Park, which touches Kentucky, Virginia, and Tennessee, was the latest park to close entirely due to the coronavirus pandemic, with the gates locked at noon local time Monday.

Units of the National Park System continued to close Friday in a bid to avoid the coronavirus pandemic, with Lassen Volcanic National Park in California, Glacier National Park in Montana, and Arches and Canyonlands national parks in Utah closing their entrance gates, and many other units further restricting visitor services. U.S. Rep. Raúl Grijalva of Arizona also called for the closure of Grand Canyon National Park.