Breaking: U.S. Senate election in Arizona has finally been decided - here's who won

Nearly a week after the election the contentious race for one of Arizona's seats in the U.S. Senate has been decided in favor of the Democrat Rep. Kyrsten Sinema (D-Ariz.)

Republican Rep. Marthy McSally (R-Ariz.), who is a former Air Force war veteran, conceded the election in a tweet with a video where she thanked everyone who worked for her campaign.

"Congrats to @kyrstensinema," McSally tweeted. "I wish her success. I’m grateful to all those who supported me in this journey."

"I’m inspired by Arizonans’ spirit and our state’s best days are ahead of us," she added.

"Meth lab of Democracy"

The election was marked with controversy after several extreme statements from Sinema's past were used by the McSally campaign to damage the Democrat's chances.

In one shocking revelation, Sinema was tied to anti-war flyers that portrayed U.S. military soldiers as skeletal figures inflicting "U.S. terror" across the world.

Sinema also referred to Arizona as the "meth lab of Democracy" and "crazy" in statements from her past.

After the election, McSally took an early lead, but it was eroded as more and more counties began reporting their ballot counts over the next few days.

The Republican parties in four counties had filed a lawsuit over how signatures are verified on mail-in ballots. Even President Donald Trump weighed in, opining in a Tweet that perhaps they needed to hold the election again.

"Just out," the president tweeted, "in Arizona, SIGNATURES DON’T MATCH. Electoral corruption - Call for a new Election?"

"We must protect our Democracy!" he added.

Where does this leave the Senate?

The victory by Sinema represents a flip of the seat from Republican control to that of the Democrats in the U.S. Senate, and cuts the Republican lead to 51 seats in the upper house of Congress. There are still two U.S. Senate races with results undetermined - in Florida and Georgia.

Here's the Fox News video on the McSally concession: