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.

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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.

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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.

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