Microsoft billionaire Bill Gates does not seem to be a fan of Elizabeth Warren’s new tax on the super-rich.

Gates, who is the worlds second richest person, has even hinted that he’d vote for whoever is “more professional – which many believe to mean Donald Trump.

RT reports: Gates expressed some apprehension about the “wealth tax” proposed by Democrats Elizabeth Warren and Bernie Sanders, admitting he’d only be willing to fork over so much of his massive fortune. “I’ve paid over $10 billion in taxes, I’ve paid more than anyone in taxes! I’m glad to have—If I had to pay $20 billion, it’s fine,” he told the New York Times DealBook Conference on Wednesday.

“But when you say I should pay $100 billion, then I’m starting to do a little math about what I have left over,” the world’s richest man said, to laughter from the audience. “Just kidding,” he added, while his body language suggested he wasn’t.

Pressed to choose between President Donald Trump – who he has criticized before – and Warren, Gates got fidgety again, waving his hands around and promising to vote for whoever is “more professional.”

“I hope the more professional candidate is an electable candidate.“

Gates has contributed to candidates in both parties, but pours money into progressive social causes. He was a fan of Trump’s predecessor Barack Obama, lamenting that he did not have “more power” to push his agenda through Congress, and has slammed Trump for not “setting a good example” for Americans.

Hearing his refusal to commit, Democrats pounced on the software tycoon, interpreting his statement as a “threat” to vote for Trump.