A Black Lives Matter protester interrupted a United States Conference of Mayors event in Washington Wednesday calling on Chicago Mayor Rahm Emanuel to resign. Goggans stood silently holding a sign that said "16 shots and a cover up #LaquanMcDonald #ResignRahm." Others in the room chanted "Black Lives Matter." McDonald was a black teenager who was shot to death 16 times by a Chicago police officer. Emanuel has been fighting for his political life amid high-profile police shootings of young black men in Chicago, and the subsequent response from city officials. Emanuel said Chicago is working to build more trust between residents and police.