Just what has Donald Trump have against highly successful and powerful ethnic minorities that when every form of attack fails, he picks on their citizenship?

For years Trump relentlessly picked on President Obama and questioned his American birthright and citizenship.

Now he is openly challenging the citizenship of the Democratic Vice presidential candidate Kamara Harris with no real or cogent supporting evidence .

A legal adviser and spokesperson for Trump’s reelection campaign is questioning the citizenship of Sen. Kamala D. Harris, a California native and the presumptive Democratic nominee for vice president. Later in the day, Trump said Harris possibly “doesn’t meet the requirements” to serve as vice president.

Harris’s citizenship is not under any serious question, legal experts told us.

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The VP has the same eligibility requirements as the president,” Juliet Sorensen, a law professor at Northwestern University, told the Associated Press (AP) news agency.

“Kamala Harris, she has to be a natural-born citizen, at least 35 years old, and a resident in the United States for at least 14 years. She is. That’s really the end of the inquiry.”

Trump perhaps knows this, because he announced in 2018 that he would try to end birthright citizenship with an executive order, which was never released.

The contentious issue arose after a conservative law professor questioned Ms Harris’ eligibility based on her parents’ immigration status at the time of her birth, Mr Trump was asked about the argument at a press conference on Thursday.

The president said: “I just heard it today that she doesn’t meet the requirements and by the way the lawyer that wrote that piece is a very highly qualified, very talented lawyer.

I have no idea if that’s right. I would have assumed the Democrats would have checked that out before she gets chosen to run for vice-president.

“But that’s a very serious, you’re saying that, they’re saying that she doesn’t qualify because she wasn’t born in this country.”

The reporter replied there was no question that Ms Harris was born in the US, simply that her parents might not have been permanent US residents at the time.