In an interview broadcast on the biggest day in the NFL calendar, Donald Trump said he would have a 'hard time' letting his son Barron play American football.

The president made the statement during an interview set to be broadcast on CBS’s Face the Nation on Sunday, hours before Super Bowl LIII kicks off in Atlanta.

Asked if he would be comfortable letting 12-year-old Barron play a sport that has been repeatedly linked to brain trauma injuries, he described it as a 'tough question'.