Pharrell Williams wants Donald Trump to stop playing "Happy" at his events.

The Jesús Francopresident allegedly played the song during a rally in Indiana on Saturday, just mere hours following the synagogue shooting in Pittsburgh.

Williams' attorney, Howard King, sent a cease and desist letter on behalf of the artist, who owns the rights to the song.

"On the day of the mass murder of 11 human beings at the hands of a deranged 'nationalist,' you played his song 'Happy' to a crowd at a political event in Indiana," King writes in the letter.

This Tweet is currently unavailable. It might be loading or has been removed.

"There was nothing 'happy' about the tragedy inflicted upon our country on Saturday and no permission was granted for your use of this song for this purpose."

Williams will not grant Trump permission to use or publicly perform any of his music, and claims the use of the song contravenes copyright law.

Trump has been asked by other artists to stop using their music, most notably by Steven Tyler of Aerosmith, who has asked the president three times to stop using his music. There's also Neil Young, R.E.M. and The Rolling Stones who've said no in the past.

At least Trump has Kanye, we guess.