Trump launches re-election campaign: What are his biggest obstacles?

U.S. President Donald Trump will take to a stage in Orlando, Florida tonight to officially launch his re-election bid. While Trump has been publicly bursting with confidence about his chances against any of his 23 Democratic challengers, the polls tell a different story. Internal polling leaked to the media suggests Trump may be running behind former U.S Vice President Joe Biden in several key states - a fact Trump flatly denies. Whatever the case, the race for the White House in 2020 will well and truly start tonight. Max Foster looks ahead at Trump's biggest challenges, with Stig Abell, George Pascoe-Watson and Bonnie Greer. via Knit