The Purge: Election Year

"The Purge: Election Year" is a horror movie released in 2016, about a dystopian future where all crime is legal for one night a year.

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Donald Trump is already thinking about his re-election campaign for 2020, and he hasn't even been sworn in yet for his first term as President of the United States.

The president-elect told The Washington Post on Wednesday that he's already got a campaign slogan that builds on his first promise, "Make America Great Again."

"Are you ready?" Trump asked the newspaper. "'Keep America Great,' exclamation point."

Trump can then be heard calling for a lawyer and telling someone in his office to trademark the new slogan, with and without the punctuation mark. However, a trademark may be difficult as the phrase is already familiar to horror movie fans.

2016 horror movie "The Purge: Election Year" used "Keep America Great" as a tagline.

That's because "Keep America Great" is the same tagline used for the 2016 film "The Purge: Election Year." It appeared on movie posters and flashed across the screen in large letters during the trailer.

"The Purge: Election Year" is the third film in the series about a dystopian future where all crime -- murder, rape, theft, destruction of property, etc. -- is legal for one night a year. Ethan Hawke and Lena Headey starred in the 2013 original; Frank Grillo and Elizabeth Mitchell led the second sequel, which follows a presidential candidate being targeted by people who want to stop her from eliminating the Purge.

Writer-director James DeMonaco told Entertainment Weekly that the third "Purge" movie was influenced by the 2016 election, even though it was released five months before Trump won the White House race.

"Little things drip into you when you're writing or you're on set -- you're grabbing from the ether or what's out there in the press," DeMonaco told EW. "I think there's a lot of representation of everyone who's in the game right now, from Donald Trump to Hillary Clinton to Bernie Sanders to John Kasich. I'd like the audience to play with it and see who they feel is representative of the actual candidates in the real world, without me saying who's who."

Grillo, who plays a Secret Service agent protecting the candidate, told ComicBook.com that the movie wasn't originally subtitled "Election Year."

"Oddly enough, the guy who plays the President in the movie, he plays him like Trump - totally by accident," the actor said last year. "There's a lot of parallels between the GOP race and the movie and the messages that are being put forward and then Universal got this great idea to call it 'Purge: Election Year.'"

It's unclear whether Trump is aware of the similarity, but he told the Post that he's "so confident" in the new slogan because "the country is going to be great" when he takes office.

Stephen Colbert joked about the slogan on "The Late Show" Wednesday night, suggesting alternatives like "Make America Great Again... Again!" and "Okay, This Time We Are Really Going to Make America Great Again, I Swear."

See the trailer for "The Purge: Election Year," featuring the tagline "Keep America Great," below. Note: Video contains some disturbing content not suitable for younger viewers.