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 meet Wednesday morning.

Even as Republicans flipped enough seats to secure a Senate majority and the Associated Press predicted that former President Donald Trump would win more than enough electoral votes to win the presidency, the question remained whether the Republican Party would retain its majority in the House of Representatives would maintain or expand, unresolved.

More than 50 House races were not called at the time of writing by the AP, and among them are swing districts in which Republicans are running in districts that favor Democrats, or Democrats are running in districts that favor Republicans.

Republicans currently hold a four-seat majority, and vote counts from uncalled races in places like Pennsylvania, New York, California and Arizona indicate that whichever party ultimately claims a majority, it could be an equally slim margin.