President Donald Trump says Democratic running mate Kamala Harris is not qualified to serve as US Vice-President, amplifying a fringe legal theory critics decry as racist.
Ms Harris was born to a Jamaican father and Indian mother in Oakland, California, on 20 October 1964.
But a conservative law professor has questioned her eligibility.
For years, Mr Trump promoted a false “birther” theory that President Barack Obama was not born in the US.
Ms Harris, a California Senator, was unveiled on Tuesday as the first woman of colour to serve as running mate on a main-party US presidential ticket.