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Every uncalled election campaign in 2024 ended in a fight for control of Washington

Former President Donald Trump has secured a second term in the White House and his Republican Party has won control of the Senate. But control of the House is still up in the air, as is the size of the new Senate majority.

In the battle for the House, Democrats face an uphill climb to grab the four seats needed to flip the chamber, while Republicans only need to win a few more contests to retain the majority. With more than a dozen House races yet to be called and many of them close, Democrats would have to keep all of their contested seats and flip a few Republican-held seats to get to the 218 seats needed for the majority .

With votes still being counted, here's a look at the key races that have not yet been called by the NBC News Decision Desk (read more about how these races are called). While some of the contested states can be predicted relatively quickly, it could take days or even weeks to resolve control of the House.

Presidential battlefields

With Trump's victory in Michigan predicted by NBC News Wednesday afternoon and a victory in Nevada announced early Thursday morning, only one battleground state remains unaccounted for.

In the Sun Belt, Trump is leading in Arizona, but the state is too close to call.

The Senate elections have yet to be held

Arizona Senate: Democratic Rep. Ruben Gallego is ahead of Republican Kari Lake in the vote count, but the race is still too early to decide. Lake trails Trump in the state, while Gallego outperforms Vice President Kamala Harris. Gallego, a Marine veteran, touted his military service in his race against Lake, a former local television news anchor. Lake unsuccessfully ran for governor in 2022 and made false claims that her 2022 campaign was affected by voter fraud.

Pennsylvania Senate: Although Trump is expected to win Pennsylvania, the Senate race there is still too close. Democratic Sen. Bob Casey is running for a third term against Republican Dave McCormick, a former hedge fund CEO who unsuccessfully ran for the Republican Senate nomination in 2022.

Home control at stake

Control of the House of Representatives is still unclear as significant competitive races have not yet been called, including a number of key races in California alone. There are also other races that are not expected to be competitive but have not yet been scheduled because few votes have been counted.

Alaska at-large district: Republicans want to capture this statewide seat, which Trump easily held. Republican Nick Begich leads Democratic Rep. Mary Peltola, but he is float around the 50% threshold required to ultimately win the race. Should he fail to meet that threshold, the race will move to ranked-choice voting, but Republicans are confident they would still retain the seat in that scenario.

Arizona's 1st District: Republican Rep. David Schweikert is in a race in the Phoenix suburbs against Democrat Amish Shah, a former state lawmaker.

Arizona 6th District: Republican Rep. Juan Ciscomani is trailing his Democratic opponent, former state Sen. Kirsten Engel, in this competitive district in the Tucson suburbs.

California's 9th District: Democratic Rep. Josh Harder is narrowly ahead of his Republican opponent, Stockton Mayor Kevin Lincoln.

California's 13th District: Republican Rep. John Duarte is in a tough race against Democrat Adam Gray, a former state lawmaker, in this Central Valley district.

California's 21st District: Democratic Rep. Jim Costa is in a tight race in this Fresno-area district with Republican Michael Maher, a former FBI agent.

California's 22nd District: Republican Rep. David Valadao, one of two remaining House Republicans who voted to impeach Trump following the Capitol insurrection on January 6, 2021, is leading his Democratic opponent, former state Rep. Rudy Salas.

California's 27th District: Republican Rep. Mike Garcia is running a tough race in this Southern California district against Democrat George Whitesides, a former NASA chief of staff and Virgin Galactic CEO.

California's 41st District: Democrats have targeted this district in Riverside County, and Republican Rep. Ken Calvert is in a competitive race with Democrat Will Rollins, a former prosecutor.

California's 45th District: Republican Rep. Michelle Steel is leading Democratic Army veteran Derek Tran in one of the most expensive races in the country.

House Speaker Mike Johnson, R-La., wants to lead the House majority for a full term.Bill Clark / CQ-Roll Call, Inc via Getty Images file

California's 47th District: Republicans are trying to flip this open seat in Southern California, and Republican Scott Baugh, a former state lawmaker, is in a competitive race against former state Sen. Dave Min.

California's 49th District: Also in Southern California, Democratic Rep. Mike Levin is running a tough race against car dealer Matt Gunderson, a self-described “pro-choice” Republican.

Colorado's 8th District: Democratic Rep. Yadira Caraveo is in a tight race against Republican Rep. Gabe Evans in the Denver suburbs.

Iowa's 1st District: Only a few hundred votes separate Republican Mariannette Miller-Meeks and Democrat Christina Bohannan, a former state representative. It's familiar territory for Miller-Meeks, who won her 2020 race by just six votes.

Maine's 2nd District: Democratic Rep. Jared Golden has been a top target for Republicans, hovering just above the 50 percent threshold that would allow him an outright victory over Republican Rep. Austin Theriault, a former NASCAR driver (the state holds ranked-choice voting) . .

Ohio's 9th District: Democratic Rep. Marcy Kaptur is in an extremely close race with Republican Rep. Derek Merrin.

Oregon's 5th District: Democrat Janelle Bynum is narrowly ahead of Republican Rep. Lori Chavez-DeRemer.

Washington's 4th District: Republican Rep. Dan Newhouse is narrowly ahead of Republican former NASCAR driver Jerrod Sessler. (Washington's primary puts the top two vote-getters into the general election, regardless of party.)

Sessler has Trump's endorsement of Newhouse, one of the two remaining Republicans in the House of Representatives who voted to impeach Trump following the Capitol insurrection on January 6, 2021.

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