Andrew Sidamon-Eristoff served as the New Jersey state treasurer under Governor Chris Christie from 2010 to 2015. Now, Sidamon-Eristoff has been named the state campaign chair for Libertarian Party presidential candidate Gary Johnson and his running mate William Weld.

The decision will surely raise eyebrows, since Sidamon-Eristoff owes his prominence to plum appointments by Rudy Giuliani and Chris Christie, who just happen to be among Republican Donald Trump’s biggest backers. According to Sidamon-Eristoff, his decision to chair the Libertarian campaign does not mean that he is no longer a Republican.

“To be clear: I have always been and remain a loyal Republican,” Sidamon-Eristoff said in a statement. “But partisan loyalty should not be blind or unconditional. As an American who believes strongly in maintaining the integrity of, and confidence in, our political processes and public institutions, I cannot in good conscience support my party’s nominee for President. Nor can I support a Democratic Party nominee who does not share my Republican values or priorities.”

For Sidamon-Eristoff, Johnson and Weld provide a reasonable alternative to Republican nominee Donald Trump and Democratic nominee Hillary Clinton.

“Fortunately, Governors Johnson and Weld offer an experienced, positive, and pragmatic vision of fiscal restraint, limited but responsible government, and personal freedom that faithfully reflects the center-right political values and priorities that I have always held dear, and that I believe must continue to play a prominent role in our national dialogue,” he said.

New Jersey Libertarian Party Chair Patrick McKnight said that Sidamon-Eristoff’s involvement in the Johnson-Weld campaign is exciting for the party.

“I couldn’t be more excited to have Mr. Sidamon-Eristoff leading the Johnson Campaign in New Jersey,” McKnight said. “We’ve built a diverse coalition of libertarians, independents, liberals and conservatives working together to offer voters a better alternative. Our children deserve better than the lesser of two evils. Our children deserve liberty. I thank Mr. Sidamon-Eristoff for putting his principles before his party.”

Before his work as New Jersey state treasurer, Sidamon-Eristoff served under the administrations of New York State Governor George Pataki and New York City Mayor Rudy Giuliani.

Disclosure: Donald Trump is the father-in-law of Jared Kushner, the publisher of Observer Media.