Rep. Ruben Gallego (D-Ariz.) raised close to $22 million in the third quarter of fundraising for this year in the Arizona Senate race, his campaign announced Thursday.

Gallego’s campaign announced the Arizona Democrat had raised more than $21.7 million between July and September of this year, with donations of $100 or less making up 95 percent of the contributions he received. The campaign also noted that more than 271,000 people contributed to his campaign last quarter.

Gallego is running against Republican Kari Lake for the race to replace retiring Sen. Kyrsten Sinema (I-Ariz.), and the race for Sinema’s seat is seen as a critical one that will determine which party controls the Senate majority this fall. Gallego wasn’t the only Senate Democrat in a competitive race to bring in an eye-popping fundraising haul in the third quarter — Sen. Sherrod Brown (D-Ohio), facing a tough reelection bid in Ohio, raised close to $31 million, his campaign said.

It’s unclear how much Lake has raised in the last quarter, though candidates have until Oct. 15 to file their third-quarter campaign filings.

“Arizonans know we need Ruben Gallego in the U.S. Senate, which is why over 437,000 small-dollar donors have chipped in to support the campaign,” Gallego campaign manager Nichole Johnson said in the press release. “Because of their generous support, we are going to defeat Kari Lake and send a Marine combat veteran with a lifetime of service to the Senate.”