Donald Trump called on President Joe Biden to undergo a cognitive test, criticising the Democratic candidate, who is highly likely to be his opponent in the upcoming November US election.

Donald Trump calls on Joe Biden to undergo cognitive test

More US States went to polls on 'Super Tuesday' than any other day to pick a Presidential nominee. This report explains the most decisive day ahead of the 2020 Presidential elections.

US Presidential Elections 2020: Joe Biden projected to win 7 states

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Donald Trump calls on Joe Biden to undergo cognitive test

US Presidential Elections 2020: Joe Biden projected to win 7 states