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CHICAGO -- A member of the Ricketts family is giving millions to a super PAC targeting Donald Trump.

USA Today reports Marlene Ricketts, the wife of T.D. Ameritrade founder Joe Ricketts, gave $3 million to Our Principles PAC.

It's been airing ads against Trump and sending out mailers ahead of states' primaries.

Trump responded a tweet that reads: "I hear the Rickets family, who own the Chicago Cubs, are secretly spending money against me. They better be careful, they have a lot to hide!"

I hear the Rickets family, who own the Chicago Cubs, are secretly spending $'s against me. They better be careful, they have a lot to hide! — Donald J. Trump (@realDonaldTrump) February 22, 2016

The Ricketts family is not commenting.

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