When the NBC host, Kristen Welker, asked whether she had ruled out endorsing Mr. Trump, Ms. Haley deflected, saying, “If you talk about an endorsement, you’re talking about a loss. I don’t think like that.”
After an extended back-and-forth related to her pledge last year to support her party’s nominee — which the Republican National Committee required candidates to sign in order to participate in debates — she referred to Mr. Trump’s recent endorsement of Lara Trump, who is married to his son Eric, to be a party co-chair.
“The R.N.C. is now not the same R.N.C.,” Ms. Haley said. “Now it’s Trump’s daughter-in-law.”