President Biden, in a surprise phone interview on MSNBC on Monday morning, said he’s frustrated by the discussion about his fitness and the calls for him to step aside. “Any of these guys that don’t think I should run, run against me. Announce for president, challenge me at the convention,” he said. Biden also sent a letter to his party’s lawmakers in Congress on Monday, insisting that he would stay in the race and calling for an end to the drama within the Democratic Party. The letter comes amid rising calls from within his party for him to step aside after his poor debate performance.