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Bret Baier asked a similar question to the one he posed to candidates at the first Fox News GOP debate.

Baier asked Ted Cruz, Marco Rubio and John Kasich whether they would pledge to support Donald Trump if he wins the nomination.

Rubio said he would do so because the GOP must defeat Hillary Clinton or the socialist Bernie Sanders.

Cruz said he would simply because he already gave his word that he would.

Kasich said he would too but that he believes "before it's all said and done, I'll be the nominee."

Trump was asked whether he'd support one of the other three if he does not win the nomination.

"Yes I will," he said.

Watch the responses above.

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