Rep. Mike Waltz will resign from the House of Representatives on January 20 to serve as national security adviser for President-elect Donald Trump. His resignation, along with former Rep. Matt Gaetz and the pending departure of Rep. Elise Stefanik, leaves House Republicans with at least two vacant seats as they prepare for Trump's administration. The special elections to fill these seats are scheduled for January 28 and April 1, complicating the party's efforts to achieve its legislative agenda during the first 100 days in office. Waltz's resignation coincides with critical House votes, including the election of the Speaker.