Trump issued a warning to Obama if he chooses to campaign alongside Clinton

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The presumptive Republican candidate was warned Obama he will be verbally attacked if he chooses to help with the Democrat candidate ahead of the general election.

His comments come just a day after President Obama appeared on the Tonight Show with Jimmy Fallon and criticised the Republican party for their selection.

Despite facing more than a week of criticism from his own party over his attacks against a Hispanic judge, Trump has not backed down from making controversial speeches.

Speaking to supporters, the presumptive candidate went after his old enemy Hillary Clinton at his first campaign rally since the end of the Republican and Democratic primary contests in Richmond, Virginia.

Trump also had a word or two to say about Barack Obama, who has publicly congratulated Clinton.