We might finally have a definitive explanation behind President Trump's rare cameo on Home Alone 2.

In an interview with The Hollywood Reporter, Academy Award winner Matt Damon detailed the requirements for filming at Trump Organization buildings.

"The deal was that if you wanted to shoot in one of his buildings, you had to write him in a part," Damon said. "Martin Brest had to write something in Scent of a Woman — and the whole crew was in on it. You have to waste an hour of your day with a [expletive] shot: Donald Trump walks in and Al Pacino’s like, 'Hello, Mr. Trump!' — you had to call him by name — and then he exits."

"You waste a little time so that you can get the permit, and then you can cut the scene out," Damon added. "But I guess in Home Alone 2 they left it in."

Chris O'Donnell, who starred in Scent of a Woman, shared a similar account when he appeared on Conan earlier this year.

“We got new pages given to us one day when we were filming [at] the Plaza Hotel — which I guess Trump owned at the time — and it said we’re doing a scene with Donald Trump," O'Donnell told Conan O'Brien. "It explained to us in that in order for us to film at the Plaza we had a little walk-on part for Donald and [ex-wife] Marla [Maples].”

The scene, O'Donnell recalled, wasn't a speaking part.

“It was we pull up in a limo and [Al] Pacino and I left and another car pulled up and it was Donald Trump and Marla Maples walked out and went in,” O'Donnell added.

Trump's clip in the 1992 acclaimed film didn't make the final cut.