Hillary Clinton Acknowledges Donald Trump Will Most Likely Be the Republican Nominee

"But I'm not going to handicap their race," she said.

"I mean, right now it looks like that," she continued. "But I'm not going to handicap their race. I want to let them decide that."

Clinton sent a fundraising email to supporters Thursday with the subject line, "Donald Trump."

"I've said for a long time that Trump isn't a joke, and now, he's looking more and more likely to be the Republican nominee," she wrote in the email.

Later Thursday night, during a campaign event in Charleston, Clinton didn't mention the "T" word, but she did appear to take a veiled swipe, pledging to do "whatever I can" to "move away from campaigns of insults and prejudice and paranoia."