"The Rosenstein memo was phony, we want testimony from Comey!" the protestors chanted, criticizing Trump's decision to fire the director of the Federal Bureau of Investigation after receiving a recommendation from Deputy Attorney General Rod Rosenstein.
That rally was dubbed "Pittsburgh, Not Paris" - a reference to the president's statement Thursday, in announcing his plan to withdraw from the worldwide climate treaty, that "I was elected to represent the citizens of Pittsburgh, not Paris".
Timothy Snyder, professor of history at Yale University and the author of "On Tyranny", said he felt he had to take pert in the March for Truth.
Trump said the decision was to support American workers.
Supporters said their voices are no less important.
"'America first" and "Make America Great Again' is exactly what he campaigned on".
The crowd gathered to celebrate the President's decision to withdraw the US from the Paris Climate Agreement.
Trump's hidden tax returns were concerning to 54-year-old Wendy Dickerson, who made the three-hour drive from Wheatland, Wyoming, to attend the protest.
"Basically he's a Russian mobster masquerading as president", another man told 1010 WINS. And some said other issues mattered more to them than the climate pact - starting with building a wall on the Mexican border. "We will not go back to sleep".
Demonstrators take part in the March for Truth rally on the National Mall in Washington, D.C. on June 3, 2017.
"We don't know all the facts yet, but we know this much", Raskin said.
- Thousands of New Yorkers took to the streets demanding answers regarding President Trump's ties to Russian Federation.
EU, China to reaffirm support for climate pact
But the leaders of France, Germany and Italy said in a joint statement that they "firmly believe" the deal can not be reworked. However, Trump indicated that re-entry may not be a top priority for his administration.
Senate to hear from Comey; Dems raise new Sessions questions
Until he was sacked on May 9, Comey was leading the FBI's investigation into Russian meddling, which had started back in July. Adam Schiff of California, said Nunes approved the unmasking subpoenas without consulting with Democrats on the committee.