Donald TrumpDonald TrumpSeven key players for Trump on immigration Spicer: Media coverage of Trump has not been fair Kasich finds it hard to rule out 2020 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 RubioLongtime GOP incumbent will not seek reelection Overnight Defense: Commander calls North Korea crisis 'worst' he's seen | Trump signs VA order | Dems push Trump to fill national security posts What’s with Trump’s spelling mistakes? MORE and Ted CruzTed CruzKasich finds it hard to rule out 2020 Trump in campaign mode at NRA convention Trump’s hands are tied on 9th Circuit 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.