A former spokesman for Jeb Bush's failed presidential campaign has joined a new super-PAC aimed at derailing Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE, according to The New York Times.

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Tim Miller, who was Bush's communications director, has been hired by Our Principles PAC, a group funded almost entirely by Marlene Ricketts, whose family owns the Chicago Cubs.

Last week, GOP front-runner Trump lashed out at the Ricketts family after learning of their plans to fund an ad campaign against him.

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