Former homeland security adviser says he warned Trump that Ukraine conspiracy theory was debunked

President Trump's first homeland security adviser said on Sunday that he told Trump on multiple occasions that a conspiracy theory about Ukraine meddling in the 2016 election was "completely debunked." While appearing on This Week with George Stephanopoulos, Thomas Bossert said he was "deeply frustrated" that Trump's personal lawyer, Rudy Giuliani, and others outside the administration were "repeating that debunked theory to the president. It sticks in his mind when he hears it over and over aga...