Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE mocked rapper Eminem on Tuesday for preparing a response in case President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE reacts to the rapper’s critical new album.

“It’s a bit odd that he’s admitting to having prepared heavily to take on a 70 year old politician. Probably not the best look. So much for freestyle. #WillTheRealLoserPleaseStandUp,” Trump Jr. tweeted, referencing Eminem’s song “The Real Slim Shady.”

It’s a bit odd that he’s admitting to having prepared heavily to take on a 70 year old politician. Probably not the best look. So much for freestyle. #WillTheRealLoserPleaseStandUp https://t.co/suToF4D193 — Donald Trump Jr. (@DonaldJTrumpJr) December 19, 2017

Eminem released a new album, “Revival,” last week. The 45-year-old rapper, whose real name is Marshall Mathers, goes after Trump and his family members in multiple tracks.

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In one, Eminem calls the president an “Aryan.” In another, he talks about having Trump's elder daughter, Ivanka, in the trunk of his car, while a third song describes Eminem flirting with first lady Melania Trump Melania TrumpTrump privately blamed Black Americans for lacking initiative: report The Hill's 12:30 Report: Ginsburg lies in repose Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE.

The rapper told Vulture on Monday he's prepared should the president fire back.

“I’ve got lines ready if he says something about me," he said.

“I’m trying to get a message out there about him. I want our country to be great too, I want it to be the best it can be, but it’s not going to be that with him in charge,” he continued.

Eminem previously expressed frustration that Trump had not responded to his performance at the BET Hip Hop Awards in October, in which he bashed the president and his supporters.

Trump is known to occasionally respond via Twitter to high-profile critics.