The US Republican Party begins its national convention on Monday, setting the stage for Donald Trump to be officially confirmed as the party’s nominee for president, just days after an attempt on his life. Trump said he scrapped plans to rail against his opponent, President Joe Biden, in favour of a speech calling for unity. “I had all prepared an extremely tough speech, really good, all about the corrupt, horrible administration,” he told the tabloid New York Post in an interview published late Sunday. “But I threw it away.” Trump, 78, said he now wants to speak at the Republican Party conven…