Even after the Electoral College certified President-elect Joseph R. Biden Jr. as the winner of the election on Monday, some of President Trump’s staunchest allies in Congress refused to accept his loss, vowing that they could still reverse the results on the floor of the United States House of Representatives. Mr. Trump amplified their claims, recirculating an article on Tuesday about the efforts led by Representative Mo Brooks, Republican of Alabama, to challenge Mr. Biden’s victory when the House and Senate meet to formally ratify it on Jan. 6. Every four years, the House and Senate come together to formally tabulate the electoral votes and raise any final concerns about the results. 