President Trump wasted no time on Friday trotting out a nickname for Mike Bloomberg a day after The Post reported that the former Big Apple mayor was considering a presidential run.

“Little Michael will fail,” the president said outside the White House before boarding Marine One for the first leg of a fundraising trip to Georgia.

“There’s nobody I’d rather run against than Little Michael,” Trump said.

“I‘ve known Michael Bloomberg for a long time. He said a lot of great things about Trump. But I know Michael. He became just a nothing. He’s not going to do well, but I think he’s going to hurt [Joe] Biden, actually,” the president continued.

“But he doesn’t have the magic to do well. … He’ll spend a lot of money. He has some really big issues, some personal problems, and he’s got a lot of other problems. But I know Michael Bloomberg fairly well. Not too well, but fairly well. Well enough. He will not do well. And if he did [run], I’d be happy.”

To leave his options open, Bloomberg has dispatched aides to Alabama to gather signatures there, a source confirmed, even though it is not an early primary state. That’s because Alabama’s deadline for filing to be on the ballot is today.

“He thinks Biden is weak and [Bernie] Sanders and Warren can’t win,” said a source familiar with Bloomberg’s apparent about-face, which comes just months after the three-term New York City mayor took his name out of consideration.

“Mike will be making a decision quickly,” said another source close to the media mogul as other sources said the decision to jump into the crowded Democratic field could come within the next few days.

Bloomberg believes the dynamics of the race have changed on the Democratic Party side, with moderate frontrunner Joe Biden stumbling and anti-corporate candidate Sen. Elizabeth Warren (D-Mass.) gaining steam.