A Trump administration proposal to limit protests at the White House and the National Mall, including by potentially charging fees for demonstrations, is meeting stiff resistance from civil rights groups who say the idea is unconstitutional. The National Park Service is considering a plan to push back a security perimeter so that it would include most of the walkway north of the White House, a spot closed to traffic since 1995 that has become a regular venue for demonstrations. The proposal also floats the idea of allowing the agency to charge a fee for protests. Though the ideas were proposed earlier this year, they are facing renewed attention given President Donald Trump's recent comments on protests following the confirmation of Supreme Court Associate Justice Brett Kavanaugh. Trump called the protesters "screamers." The proposals "harken back to the era in which the courts had to be called upon to protect the right to dissent in the nation's capital," the American Civil Liberties Union wrote in a public comment letter to the National Park Service. "Many of the proposed amendments would be unconstitutional if adopted." ACLU attorneys wrote that if a "cost recovery" fee for demonstrations had been in place in 1963, the historic March on Washington - in which the Rev. Martin Luther King, Jr., delivered his "I Have a Dream" speech - probably "couldn't have happened."