Donald TrumpDonald John TrumpConservatives express concern over House GOP immigration bill Poll: McSally holds 14-point lead in Arizona GOP Senate primary Trump defends Nielsen amid criticism over family separations MORE stood firm in his defense of Planned Parenthood services other than abortion during Thursday night's CNN Republican debate.

"I am pro-life, I am totally against abortion having to do with Planned Parenthood, but millions and millions of women, [with] cervical cancer, breast cancer, are helped by Planned Parenthood," Trump said at the Houston event in the face of criticism from his rivals.

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"You can say whatever you want, but they have millions of women going through Planned Parenthood who are helped greatly. I wouldn't fund it, I'd defund it because of the abortion factor," he added.

He went on to note Planned Parenthood's estimation that only about 3 percent of its services deal with abortions.

Rivals Marco RubioMarco Antonio RubioDem scores upset over Republican in Florida county commissioner race GOP senators introduce bill to prevent family separations at border McCain, Coons: Trump should withdraw controversial refugee nominee MORE and Ted CruzRafael (Ted) Edward CruzConservatives express concern over House GOP immigration bill GOP senators introduce bill to prevent family separations at border Senate GOP tries to defuse Trump border crisis MORE have targed Trump over his defense of the group, which has drawn the ire of Republicans.

Republicans sought to strip federal funding for the group after controversy erupted over its handling of fetal tissue.