Biden urges “unity” after Trump assassination attempt

US President Joseph Biden has urged America to “unite as one nation” following the attempted assassination of his political rival Donald Trump. Trump says he is traveling to the Republican Convention on Sunday afternoon. Meanwhile, the FBI has still not discovered a motive for the 20-year-old gunman’s attack. Thomas Matthew Crooks was shot dead by a Secret Service sniper at the rally in Pennsylvania on Saturday afternoon. Nick Harper reports from Washington.