A small number of House races that will determine which party will hold the chamber’s majority in the 119th Congress remained too close to call on Wednesday morning.

Even as Republicans flipped enough seats to secure a majority in the Senate and the Associated Press predicted former President Donald Trump would comfortably win enough electoral votes to win the presidency, the question of whether the GOP would retain or expand their House majority remained unresolved.

More than 50 House races were uncalled by the AP at press time, and among them are swing districts that feature Republicans running in districts that favor Democrats or Democrats running in districts favoring Republicans.

Republicans currently have a four-seat majority, and the vote counts of uncalled races in places such as Pennsylvania, New York, California and Arizona indicate that whichever party ultimately claims a majority, it could be a similarly close margin.