Billionaire George Soros, an early supporter of former President Barack Obama’s 2008 White House run, called Obama his “greatest disappointment.”

In an interview published in the New York Times on Tuesday, Soros said Obama was “actually my greatest disappointment.” The billionaire was then asked by one of his aides to clarify his comment. Soros said he didn’t mean Obama’s presidency had let him down, but he felt disappointed on a professional level, because he had wanted Obama to solicit his advice. He had hoped Obama would seek his advice on economic and financial matters.

Soros said Obama “closed the door” on him after he was elected president, and he felt that his support was taken for granted.

“He made one phone call thanking me for my support, which was meant to last for five minutes, and I engaged him, and he had to spend another three minutes with me, so I dragged it out to eight minutes," Soros said.

Though he donated $25 million to Hillary Clinton and other Democratic candidates in the 2016 campaign, Soros said he doesn’t “particularly want to be a Democrat.”

He told the publication he thought highly of Sen. John McCain, R-Ariz., and he has considered financially backing centrist Republicans such as Alaska Sen. Lisa Murkowski and Maine Sen. Susan Collins.

“I shouldn’t say that. That would hurt them,” he added.