Former US president Donald Trump cemented his position as the Republican Party’s all-but-certain nominee for November’s general election with a string of wins in the Super Tuesday primary contests. The results set the stage for a White House rematch between Trump and President Joe Biden, who as the first-term incumbent faces no real challengers for the Democratic Party’s nomination. Trump easily defeated his last remaining major challenger, Nikki Haley, in primaries held in Massachusetts, Virginia, North Carolina, Oklahoma, Alabama, Tennessee and Texas, according to projections by broadcasters…