Collins explained her reasons why on Sunday during an interview on ABC's "This Week".
In March 2017, Collins endorsed Trump's first Supreme Court nominee, Neil Gorsuch, who replaced the late Justice Antonin Scalia. "A candidate of this import position who would overturn Roe v. Wade would not be acceptable to me, because that would indicate an activist agenda that I don't want to see a judge have".
"I actually don't", Collins said when asked whether she believed Gorsuch would vote against Roe v. Wade. Roe v. Wade is a constitutional right that is well-established.
Collins said Sunday that Trump made clear to her during their meeting last week that he wouldn't ask his list of potential replacements for Kennedy whether they would overturn Roe v. Wade.
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Why are Collins' comments so important?
But the Republicans are in the driving seat on the decision, with a majority grip on the Senate, the body that confirms the judge, as well as their person in the White House.
"You never know how that's going to turn out", Trump said.
CNN host Jake Tapper pointed to criticisms on the left suggesting Collins could be "played" by supporting conservative nominees who could potentially still vote to overturn Roe v. Wade, even if they hadn't "demonstrated hostility" to the program in the past. "I care deeply about who serves on the court".
Americans are sharply divided along partisan lines regarding what kind of justice they want on the Supreme Court.