By Yelena Mandenberg Former president Donald Trump’s youngest son appears to have declined an invite to be a delegate at the upcoming Republican National Convention through his monther’s PR agent. “While Barron is honored to have been chosen as a delegate by the Florida Republican Party, he regretfully declines to participate due to prior commitments,” former first lady Melania Trump’s office said in a statement. Barron, 18, was chosen as a Florida delegate at the Republican convention, with the high school senior selected to join the ranks of 41 at-large delegates representing Florida at the …