US President Donald Trump received a mixed reaction of cheers and boos as he took to the field for the national anthem during a college football game in Atlanta.

Critics on social media said it looked as though he forgot the lyrics of The Star-Spangled Banner, while his supporters said they were proud to see him stand.

The Flag Code makes no mention of whether the anthem should be sung by those present. Singing it is, however, encouraged from school onwards.

Tens of thousands of college football fans attended the match between the University of Georgia and the University of Alabama.