Iowa Republican Senate candidate Rep. Ashley Hinson on Thursday strongly condemned Republican Ohio gubernatorial candidate Vivek Ramaswamy for his controversial campaign ad featuring the estranged mother of Democratic opponent Amy Acton.

Hours before he was to appear at a rally with Hinson on Thursday, President Donald Trump defended the ad, in which Acton's mother, Donna Arthur, says her daughter has lied about her past and her struggles growing up.

Acton has spoken openly about her tumultuous relationship with her mother, whom she says she has not spoken to since she was 12 years old. Acton alleged her mother's second husband molested her between the ages of 9 and 12.

Iowa Republican Senate candidate Rep. Ashley Hinson speaks with Jonathan Karl of ABC News.

ABC News

In an exclusive interview with ABC News' Jonathan Karl for ABC News' "This Week" to air Sunday, Hinson blasted the decision to release the ad.

"It's terrible.…