Donald Trump is warning President Barack Obama that women could wrongly accuse him of sexual assault, as he claims has happened to him.

Several women have come forward in recent days accusing the Republican presidential nominee of groping them or kissing them without permission.

Trump has tried to discredit the women, mocking their appearances and accounts.

But Trump said at a rally in Greensboro, North Carolina, that those women "could say it about anybody."

And he says the president of the United States "better be careful" because women could say the same thing about him.