The official start of the trial against former US president Donald Trump in the affair surrounding the retention of secret government documents has been postponed indefinitely. The previously planned start of the trial on May 20 has been cancelled, the judge in charge, Aileen Cannon, announced in a letter on Tuesday. She said unresolved legal issues were behind the postponement. It is therefore unlikely that the trial will begin before the US presidential election in November. The decision is a success for the Republican candidate, as he is trying to delay the start of a possible trial as much…