US President Donald Trump and Vice-President J.D. Vance wrapped up the Republican Party’s first-ever midterm convention on Thursday night with promises of an America “greater than ever before”, aiming to secure crucial swing voters ahead of November’s battle for Congress. “You got to get out and vote, and you got to pretend I’m on the ballot,” Trump said, while also getting the crowd at the Dallas gathering – dubbed “Trump-a-palooza” by his supporters – to pledge allegiance to him. “You know...