Rep. Tim Burchett, R-Tenn., accused former Speaker Kevin McCarthy, R-Calif., whom he helped oust from the post last month, of elbowing him in a Capitol Hill hallway. And it wasn’t the only near-fight on the Hill on Tuesday. Across the Capitol on the Senate side, more tempers were flaring. Rekindling an old spat, Oklahoma Republican Sen. Markwayne Mullin threatened to fight Teamsters President Sean M. O’Brien in the middle of a hearing.