WASHINGTON, DC - JANUARY 20: A Black Lives Matter protester is kept out of the main ballroom during the U.S. Conference of Mayors 84th Winter Meeting at the Capitol Hilton January 20, 2016 in Washington, DC. Flint Mayor Karen Weaver met with President Barack Obama Tuesday to discuss the ongoing pollution problems in the city's public water supply that have poisoned children with lead in Flint. (Photo by Chip Somodevilla/Getty Images)
