•A federal judge has postponed until July 31 the start of the upcoming trial of President Donald Trump's former campaign chief Paul Manafort. •The judge also has granted immunity to five potential witnesses for their testimony against Manafort, who is charged with crimes related to his consulting and lobbying work for a pro-Russia political party in Ukraine. •Prosecutors in the office of special counsel Robert Mueller had asked for so-called use immunity for the five witnesses, which would bar their testimony at Manafort's trial from being used against them in a criminal prosecution. A federal judge has postponed from Wednesday...