Bloomberg, who Forbes estimates is worth more than $44 billion, spent his own money on his three successful bids for mayor. The billionaire is now considering running for the 2020 Democratic presidential nomination and has said he intends to decide whether to run in “another month or so.”

On Friday, while traveling to Austin, Texas, for a philanthropic trip, Bloomberg told reporters that if he did run, he would do so by spending his own money.

“In terms of running for office, I ran three times. I used only my own money, so I didn’t have to ask anybody what they wanted in return for a contribution,” he said, referring to a practice that would appear to run afoul of federal bribery law. “The public liked that every time they elected me. And, if I ran again, I would do the same thing.”