Who senators choose, and whether Trump ultimately endorses a candidate in the final hours, could set the tone for Trump’s attempts to assert control over the legislative branch.

With a final margin of control yet to be determined, party leaders warn any more picks from the House could backfire.

In the first seriously contested Senate Republican leadership election in decades, three senators are vying to replace longtime GOP leader Mitch McConnell when he steps down from the post at the beginning of next year.

By appointing cabinet members who are Representatives, Trump is narrowing the unfinalized Republican House majority.