Pharrell Williams isn’t too “Happy” with President Donald Trump.A lawyer for the musician filed a cease and desist letter against the president Monday after Trump used Williams’ song “Happy” during a political rally in Indiana Saturday.“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,” the letter, acquired by the New York Daily News, reads.