Colorado Republican Rep. Cory GardnerCory GardnerOvernight Defense: Joint Chiefs denounce Capitol attack | Contractors halt donations after siege | 'QAnon Shaman' at Capitol is Navy vet Lobbying world Senate swears-in six new lawmakers as 117th Congress convenes MORE raised $4.35 million in the third fundraising quarter of the year, his campaign announced Tuesday.

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At the end of August, Gardner had $3.3 million cash on hand for the final stretch of his battle with Sen. Mark UdallMark Emery UdallHickenlooper ousts Gardner in Colorado, handing Democrats vital pickup Live updates: Democrats fight to take control of the Senate The 10 Senate seats most likely to flip MORE (D). The campaign has also added $750,000 to its October ad buy.

The third quarter haul is nearly $2 million more than Gardner raised during the second quarter, and he said in a statement that the "momentum is building" for his challenge to Udall.

"The momentum on the ground is building as Coloradans realize the road to the majority runs directly through our state," he said. "It's time for a new generation of leadership in the Senate that is accountable to the next generation."

Most public polling has shown the two tied for the seat. Udall hasn't yet released his third quarter fundraising numbers.