With the news that President Donald Trump has interviewed four anti-choice judges as potential nominees to succeed Justice Anthony Kennedy on the U.S. Supreme Court, women’s rights advocates are turning their attention to Sen. Susan Collins, putting pressure on the so-called “moderate” Republican from Maine  to vote against any nominee who does not support access to abortion care and to defend Roe vs. Wade.

NARAL Pro-Choice America announced Tuesday that it had purchased full-page ads in four newspapers in Maine as well as ad space on the publications’ websites.

“Trump has been loud and clear in saying he’d pick Supreme Court Justices to end Roe v. Wade,” reads the ad. “We believe him. Don’t you, Senator Collins?”

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“Donald Trump has been crystal clear. He has a litmus test for his Supreme Court nominee: end Roe v. Wade. He said it repeatedly during his campaign. We believe him. For the sake of women in Maine, and across the country, we hope Senator Collins does too,” NARAL President Ilyse Hogue said in a statement.

Collins has equivocated regarding whether she would vote to confirm a Trump nominee who was anti-choice—as many of the 25 who are considered contenders are.

“I’m going to have an in-depth discussion with the nominee and I believe very much that Roe v. Wade is settled law, as it has been described by Chief Justice Roberts. It has been established as a constitutional right for…45 years and was reaffirmed 26 years ago,” Collins told ABC on Sunday. Last week she also described Roe as “settled law” to CBS, declining to say whether she would protect the law by voting against a judge who aims to overturn it.

Also on Sunday she told CNN, “I would not support a nominee who demonstrated hostility to Roe v. Wade because that would mean to me that their judicial philosophy did not include a respect for established decisions, established law.”

NARAL and other pro-choice groups are demanding that Collins recognize the danger of confirming a nominee who, like Judge William Pryor, has called Roe vs. Wade “the worst abomination of constitutional law in our history” or Judge Amy Coney Barrett, who has called it an “erroneous decision.”