Kennedy Presidential Library and Museum in Boston closed abruptly Tuesday afternoon, with staff escorting visitors out of the building after the Trump administration ordered the firing of five employees that were critical to its operation.

The JFK Library in Boston abruptly closed on Tuesday due to an executive order by President Trump, a library spokesman said.

The John F. Kennedy Presidential Library and Museum in Boston was forced to close Tuesday due to the “sudden dismissal of federal employees,” the library’s foundation said in a statement to CNN.