A federal building in downtown Washington that hosted a white nationalists meeting over the weekend and drew scores of street protesters cannot bar users because of their political views, its managers said.

Protesters blocked traffic near the Ronald Reagan Building on Saturday to express their outrage at the meeting of the National Policy Institute. The think tank is part of the alt-right movement that includes neo-Nazis, white supremacists and anti-Semites and came to the fore in the presidential election.

CNN reported one man who emerged from the meeting a few blocks from the White House was hurt in a scuffle with demonstrators. Police did not report any arrests.