Siskel was appointed to his new post in February in the weeks after Trump was inaugurated, but the new White House occupant was not the only item on Siskel’s list of challenges when he arrived. He took the reins as Emanuel was shaking off the political effects of the fatal police shooting of 17-year-old Laquan McDonald, and while the mayor still needed to emphasize a broad reform effort while gearing up to run for a third term.