The protest, inspired by the widely-attended Women's March held the day after Trump's inauguration, follows a string actions by the new administration scientists say undermines scientific integrity and threatens the practice of science. A Facebook page for the April 22 march has more than 300,000 followers. "It is time for scientists, science enthusiasts, and concerned citizens to come together to make ourselves heard!" organizers wrote on the page.
Among other things, the Trump administration has prohibited scientists at the Environmental Protection Agency (EPA) from speaking to the media and temporarily halted grant funding from that agency. Almost all mentions of climate change have been removed from the White House website. He has not appointed a science advisor and has made no indication if and when he might do so.