Some House Republicans, led by Rep. Mo Brooks (R-Ala.), are still planning to challenge the election results on Jan. 6, the date Congress will officially certify them. If a Republican senator joins the effort, however, it will force both chambers to take a vote on the election. But they have yet to get official buy-in from any GOP senators. Trump has yet to show any sign that he will concede. Instead, the president on Tuesday continued to reiterate false claims of voter fraud on Twitter. Jake Sherman contributed to this report.