There is said to be no love lost between President-elect Donald Trump and the National Football League.

The NFL, you remember, beat Trump and the upstart USFL (Trump owned the New Jersey Generals franchise) in court in 1986 — in essence, putting the junior league out of business.

Trump bid more than $1 billion for the Buffalo Bills in 2014 but was not the high bidder. It is not clear if enough NFL owners would have approved him as an owner if he had been the highest bidder.

So come Jan. 20, Trump will be in position to exact some revenge — if he wants to. Here’s how.

You see, the NFL is dead set against expanding legalized sports betting beyond Las Vegas. Meanwhile, New Jersey badly wants into the lucrative game.

So far the NFL, with the backing of the Justice Department and other leagues, has defeated New Jersey Gov. Chris Christie’s attempt to bring sports gambling to Atlantic City.

Trump could decide that sports gambling is a state issue, not a federal one. That would give Christie’s effort a major boost, sources said.

It would also make the NFL mad.

“I think, knowing Donald, there is a part of him that would like to get even with the NFL by saying, ‘Let’s allow gambling’ ” on NFL games in New Jersey, a source said.

A rep for the NFL declined comment. Reps for Trump’s office did not return calls.