JUDY WOODRUFF: It is primary eve for two more states, and the Democratic campaign in one of them has heated up. That has party divisions on display again, and it leaves the front-runner fighting a two-front war.

HILLARY CLINTON (D), Democratic Presidential Candidate: Let's do everything we can to win Kentucky in November!

JOHN YANG: Hillary Clinton blitzed the Bluegrass State today, her sights on a fall campaign against Donald Trump.

HILLARY CLINTON: Now, some people might say, oh, all anybody wants to hear is just, I'm going to do it, but I'm not telling you what I'm going to do.

See, I don't believe that. Americans take their vote for president seriously. And they're going to be looking at that TV screen and saying, he still doesn't have anything to tell us?

JOHN YANG: She's also trying to break her primary losing streak against Democratic rival Bernie Sanders.

NARRATOR: And she is the one who will make a real difference.

JOHN YANG: Clinton is running her first TV ads in weeks, and says she will put her husband, who won Kentucky twice, in charge of revitalizing the economy.

Sanders moved on to Puerto Rico today, where Democrats vote on June 5.

SEN. BERNIE SANDERS (VT-I), Democratic Presidential Candidate: It is unacceptable to me for the United States government to treat Puerto Rico like a colony during a time when its people are facing the worst fiscal and economic crisis in its history.

JOHN YANG: The Clinton campaign has written off Oregon, which also votes tomorrow, but is competing hard in Kentucky. She won the state easily in 2008, but recent comments about putting coal miners out of work have hurt her. And so she wants to avoid losing twice on Tuesday.

Trump had a different target today, British Prime Minister David Cameron, who called Trump's plan to ban Muslims divisive, stupid and wrong.

On Britain's Independent Television News, Trump fired back.

QUESTION: If you're president, and he's the British prime minister…

DONALD TRUMP (R), Republican Presidential Candidate: It looks like we're not going to have a very good relationship. Who knows? I hope to have a good relationship with him, but it sounds like he's not willing to address the problem, either.

JOHN YANG: Trump also blasted a New York Times story examining how he treats women. A former model who dated the New York billionaire and was quoted in the story says the paper twisted her words.

ROWANNE BREWER LANE, Former Model: They spun it to where it appeared negative. I didn't have a negative experience with Donald Trump, and I don't appreciate them making it look like that I was saying that it was a negative experience.

JOHN YANG: Trump tweeted his own take: "False reporting, and plenty of it, but we will prevail."

For the "PBS NewsHour," I'm John Yang.

JUDY WOODRUFF: We will talk with supporters on both sides of the Democratic race right after the news summary.