Trump  Jr. rips Eminem for preparing Trump response: 'So much for freestyle'
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Donald Trump Jr.Donald (Don) John TrumpHouse chairman: Trump lawyers may have given false info about Cohen payments Sarah Sanders says she was interviewed by Mueller's office Trump dismisses Ann Coulter after criticism: 'I hardly know her' MORE mocked rapper Eminem on Tuesday for preparing a response in case President TrumpDonald John TrumpRosenstein expected to leave DOJ next month: reports Allies wary of Shanahan's assurances with looming presence of Trump States file lawsuit seeking to block Trump's national emergency declaration 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.”

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.

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 TrumpMelania TrumpThe Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Trump dismisses Ann Coulter after criticism: 'I hardly know her' The Hill's Morning Report — Presented by the American Academy of HIV Medicine — Trump, Congress prepare for new border wall fight 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.