Trump said in a new interview that it would be "good" if Bloomberg decided to run because he would be "so easy" to beat. The president added they would not face each other in the general election because of the Democrats' leftward shift.

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"I think the Democrats will eat him up," Trump told Fox Business Network's "Trish Regan Primetime." "You know, you have a lot of people running. I’m hearing names that are shockingly bad, but they’re nasty."

Trump added that he was "100 percent" running for reelection in 2020.

Bloomberg re-registered as a Democrat amid speculation he is preparing to enter the 2020 presidential race.

The ex-mayor was a Democrat for most of his life, but switched party affiliation to Republican to run for New York City mayor in 2001. He then registered as an independent in 2007.

Bloomberg has pledged to spend up to $80 billion to elect Democrats in the November midterm elections, something that could endear him to the party. But many believe his stance on economic issues could hamper him if he decides to run for president.