AUSTIN (CBSDFW.COM/AP) — Many are predicting it will be one of the closest-watched Senate races of 2020, and now Texas Sen. John Cornyn says he’s sitting on $9 million for his re-election bid.

Cornyn, a Republican, announced Monday he raised more than $2.5 million during the latest fundraising quarter.

READ MORE: Euless Police Department To Give Updates On Slain Detective's Family & Funeral

Air Force veteran MJ Hegar, the most high-profile Democrat challenging Cornyn so far, says she raised more than $1 million since jumping in the race in April.

Both Cornyn and Hegar released their second-quarter fundraising ahead of Monday’s end-of-day deadline to disclose the information to the Federal Election Commission.

READ MORE: Pedestrian Killed While Attempting To Cross I-35E In Dallas

Texas had the most expensive U.S. Senate race in the country last year. Former Rep. Beto O’Rourke raised more than $80 million in his failed run against GOP incumbent Ted Cruz.

The field of Democratic challengers against Cornyn could still grow. Among those mulling a run is state Sen. Royce West of Dallas, who’s expected to decide this month.

MORE NEWS: Chicago-Area Family Still In Shock After They Hired Home Improvement Contractor Via HomeAdvisor, Only For The Contractor To Smash Up Their Property

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)