Steven Tyler threatens Trump with lawsuit over 'Dream On'

Aerosmith frontman says Trump didn't get permission for song

When it comes to intellectual property rights, not even friendship will deter Aerosmith frontman Steven Tyler from hewing to the letter of the law.

Tyler, who in August attended the Cleveland GOP presidential debate with an invitation from Trump, returned the favor by sending the leading Republican candidate a cease and desist letter to stop using the classic ballad "Dream On" at campaign events, according to TMZ.

The letter reportedly claims that Trump's campaign ignored a previous request to stop using the song after an event in Mobile, Alabama, on August 21.

"Trump For President does not have our client’s permission to use 'Dream On' or any of our client’s other music in connection with the Campaign because it gives the false impression that he is connected with or endorses Mr. Trump's presidential bid."

Trump attended an Aerosmith concert last year, tweeting at the time, "It doesn't get any better than that." Tyler, a registered Republican, decided to send the letter on grounds of business. His attorney, Dina LaPolt, confirmed to TMZ that the decision was not political.

"[Tyler's] position has always been consistent regarding copyright and intellectual property. Simply, one must get permission from the music creators. Steven wrote 100% of 'Dream On,' and this is about the un-authorized use of his property."

Watch Trump air drumming up enthusiasm to the "Dream On" at a recent campaign rally in Las Vegas.