President Donald Trump has endorsed Congressman Mike Collins in the Republican runoff for the U.S. Senate nomination in Georgia, just two days before the election. Collins is facing former University of Tennessee football coach Derek Dooley in the runoff, with the winner set to challenge Democratic U.S. Sen. Jon Ossoff in November. The runoff is seen as a proxy war between Trump and Georgia Governor Brian Kemp, with Trump's endorsement potentially impacting the outcome of the election.