Trump wins Arizona, final state in 2024 presidential election, CBS News projects. See the county-by-county results.

Rep. Ruben Gallego will defeat Republican Kari Lake in the Arizona Senate race, CBS News projects — a crucial win for Democrats amid the GOP takeover of the Senate. 

Gallego and Lake were duking it out for an open seat after Sen. Kyrsten Sinema, a former Democrat turned independent, opted not to seek reelection.

President-elect Donald Trump has won Arizona and its 11 electoral votes, CBS News projects, giving him a sweep of all seven battleground states. 

His Electoral College lead over Vice President Kamala Harris is now 312 to 226, which gives him 42 more electoral votes than the 270 he needs to clinch a second term in the White House. 

As of Thursday afternoon, CBS News estimates Arizona is leaning Trump. Mr. Biden flipped Arizona in 2020, making it only the second time since 1948 that the state had voted for a Democrat in a presidential election.

The Senate race in Arizona is lean Democrat, CBS News estimates. 

Democratic Rep. Ruben Gallego and Republican Kari Lake are facing off in for the seat currently held by Sen. Kyrsten Sinema, who is an independent but caucuses with Democrats. The seat is key for Democrats to hold onto control of the Senate, or for Republicans to take control. 

Gallego, a progressive lawmaker and former Marine, has been leading in the polls leading up to Election Day.

• Changing demographics: A longtime staunch Republican state — the birthplace of Barry Goldwater — Arizona has slowly been trending more blue in the 21st century. When Trump was elected in 2016, the state was represented by two moderate Republicans in the Senate, John McCain and Jeff Flake, both of whom opposed Trump. When McCain died in 2018 and Flake retired at the end of his term the same year, both of their seats eventually turned Democratic, although Sen. Kyrsten Sinema, elected in 2018, later left the Democratic Party to become an independent. The state's capital, Phoenix, has grown to become the fifth-largest city by population in the country. Maricopa County, which includes Phoenix and its suburbs, is the fourth largest county in the country by population and makes up more than half of Arizona's population. 

• Immigration: Immigration is one of the key issues in the state. Arizona shares about 370 miles of border with Mexico, an area that has increasingly become a crossing point for migrants. During the first four months of fiscal year 2024, Border Patrol recorded more than 250,000 migrant apprehensions in the Tucson sector, the most of any region patrolled by the agency, according to federal government statistics. The border wall once touted by Trump was halted by Mr. Biden when he took office in 2021, although by the end of that year, the Department of Homeland Security authorized the U.S. Customs and Border Protection to move forward with "activities necessary to address life, safety, environmental and remediation requirements" related to the Defense Department's 284 border barrier projects, according to the Arizona Republic. Trump has promised to restart border wall construction.

• Abortion: Arizona bans abortion at 15 weeks, which was put into effect in 2022. Earlier this year, the state Supreme Court upheld a near-total ban on abortions dating back to 1864, although the GOP-controlled legislature quickly reversed the ban and it was signed by Democratic Gov. Katie Hobbs, reverting the law back to the 2022 ban. Since then, abortion rights groups have secured enough signatures to put a measure on the ballot.

Sen. Kyrsten Sinema, a former Democrat turned independent and long a boogeyman for liberals, is retiring this year, and Democratic Rep. Rueben Gallego is facing Republican Kari Lake in a race for the open seat. Gallego, who represents Phoenix and the surrounding western suburbs in Congress, has a fundraising advantage, having raised nearly $22 million through the end of Sept., while Lake has nearly $17 million. 

A polarizing ally of Trump, Lake first ran for governor in 2022 and refused to accept the election results. A CBS News poll conducted from Oct. 11-16 had Gallego leading Lake by 9 points. 

A CBS News poll conducted from Oct. 11-16 in Arizona had Trump leading by 3 points against Harris. Trump is boosted by voters who say immigration/border and the economy are their most important issues, while Harris has advantages with voters who prioritize abortion rights and the state of democracy, keeping this race close.

Polls in Arizona close at 7 p.m. MT (9 p.m. ET).