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The parents of Republican U.S. Senate candidate Kevin Nicholson gave the maximum allowable contributions to the Democrat he hopes to unseat — U.S. Sen. Tammy Baldwin, of Madison — months after Nicholson began his campaign.

Nicholson’s parents, Michael and Donna Nicholson, both gave $2,700 in December to Baldwin, federal records show. Nicholson is a former Democrat, and his parents have a long history of donating to Democratic candidates. CNN first reported the donations.

Kevin Nicholson, a Delafield management consultant and Iraq War veteran, launched his campaign in July.

Nicholson is a former president of the national College Democrats who said he underwent a political conversion to Republicanism after serving in Iraq and Afghanistan. He’s said he comes from a Democratic family and previous reports showed his mother contributed to Baldwin during her first U.S. Senate campaign in 2012.

Nicholson is vying with at least one other Republican, state Sen. Leah Vukmir, for the GOP nomination.

Nicholson’s campaign did not respond to a request for comment Tuesday from the Wisconsin State Journal. In a statement to CNN, he said: “My parents have a different worldview than I do, and it is not surprising that they would support a candidate like Tammy Baldwin who shares their perspective.”

The Associated Press contributed to this report.