It has been revealed a top-tier United States federal law enforcement agency investigated popular rapper Eminem over "threatening" lyrics about Donald Trump's daughter Ivanka.

Freedom of information documents obtained by Buzzfeed show a case against the rapper, best known for his track The Real Slim Shady, was opened in January last year after a "concerned citizen" reported inappropriate comments towards Mr Trump and his daughter.

The lyrics in question were from Eminem's song Famed which was released in 2017.

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The song talks about a murder Eminem — real name Marshall Mathers — cannot remember and asks why Ivanka, who was also called a "dumb little blonde girl" was dumped in the trunk of his car.

"Donald Duck's on as the Tonka Truck in the yard. But dog, how the f--- is Ivanka Trump in the trunk of my car? … ' cause I feel somewhat responsible for the dumb little blonde Girl, that motherf----- ' baton twirler that got dumped in the pond, Second murder with no recollection of it …"

It was alleged that one of Eminem's songs contained inappropriate comments towards President Trump and his daughter, White House advisor Ivanka Trump (pictured). Photo / Getty Images
It was alleged that one of Eminem's songs contained inappropriate comments towards President Trump and his daughter, White House advisor Ivanka Trump (pictured). Photo / Getty Images

The 40 pages of redacted documents provided to Buzzfeed detailed a series of "threats" and negative comments made by Mr Mathers towards Trump and his family.

In the past, Mr Mathers called Trump an Aryan and has said Trump makes his "blood boil".

An interview between Mr Mathers, three unnamed members of his legal team and two Secret Service agents took place on January 16, 2018.

Freedom of Information documents obtained by Buzzfeed show the Secret Service investigated Eminem for lyrics about Ivanka Trump. Source / Twitter
Freedom of Information documents obtained by Buzzfeed show the Secret Service investigated Eminem for lyrics about Ivanka Trump. Source / Twitter

During the interview agents read aloud lyrics which Mathers rapped at an awards show and interview and questioned him about fan mail.

"Mathers was familiar the song and began rap along with the interviewers as the verse was read," the documents reported.

Freedom of Information documents obtained by Buzzfeed show the Secret Service investigated Eminem for lyrics about Ivanka Trump. Source / Twitter
Freedom of Information documents obtained by Buzzfeed show the Secret Service investigated Eminem for lyrics about Ivanka Trump. Source / Twitter

in a track released by the artist in 2018 which claimed the rapper was visited by the Secret Service spurred speculation at the time that he may have been telling the truth.

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"Cause Agent Orange just sent the Secret Service / To meet in person to see if I really think of hurtin' him / Or ask if I'm linked to terrorists / I said, 'Only when it comes to ink and lyricists."

The secret service refused to comment on this at the time, prompting BuzzFeed to file a Freedom of Information Act request in which these documents were revealed to find out if agents really were sent to speak with Eminem.