Vivek Ramaswamy Ad

Donald Trump is backing Vivek Ramaswamy amid his controversial campaign ad attacking his political opponent, Amy Acton.

Trump claims the ad -- which shows Amy's estranged mother calling her a liar for accusing her of abuse -- is being targeted by the press in a "concerted and well-coordinated attack."

Here's the thing ... there's been bipartisan backlash over the ad, because Amy's stepfather was charged with raping her when he was married to her mother when Amy was a child.