New York (CNN Business) Warren Buffett already knows which billionaire he likes for president.

Buffett said he would get behind former New York City Mayor Michael Bloomberg, who hasn't declared yet that he's running for office in 2020.

But he's not keen to support billionaire former Starbucks CEO Howard Schultz, who also hasn't declared, but has said he's considering running as a centrist independent.

that if Bloomberg gets into the Democratic primary, as he is Buffett said during a CNBC interview on Mondaythat if Bloomberg gets into the Democratic primary, as he is thinking about doing , he would support him.

"I think he would be a very good president," Buffett said. "He and I disagree on some things. But I think that he knows how to run things."

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