Rap star Eminem has asked aspiring Republican presidential candidate Vivek Ramaswamy to stop using his songs.
The letter comes more than a week after the biotech entrepreneur delivered an impromptu performance of Lose Yourself at the Iowa State Fair.
Eminem made the request via performing rights organisation BMI in a letter dated 23 August.
Mr Ramaswamy is vying to unseat Donald Trump as the presumed 2024 Republican nominee.
A spokeswoman for Mr Ramaswamy said he will comply with the request by Eminem, whose real name is Marshall Mathers III.
The letter says the company "received a communication from" Eminem objecting to the Republican's use of his "musical compositions".
"BMI will consider any performance of the Eminem works by the Vivek 2024 campaign from this date forward to be a material breach" of its licence, it adds.
Referring to an Eminem lyric, campaign spokeswoman Tricia McLaughlin said in a statement to US media: "Vivek just got on the stage and cut loose."
"To the American people's chagrin, we will have to leave the rapping to the real slim shady."
Mr Ramaswamy posted on X, formerly known as Twitter, to make light of the situation.
"Will The REAL Slim Shady Please Stand Up? He didn't just say what I think he did, did he?" he wrote, referring to more of Eminem's lyrics.