Republican presidential nominee Donald Trump said in an interview aired Sunday that his Democratic rival is the one with a party unity problem.

He pointed to the raucous resistance to Democratic nominee Hillary Clinton by supporters of far-left candidate Sen. Bernard Sanders, who endorsed Mrs. Clinton at the party convention last week.

“If you look at what’s going on in terms of unity, the Bernie people are angry,” Mr. Trump said on ABC’s “This Week.”

He said that Mr. Sanders also looked angry by the end of the four-day convention in Philadelphia, when Mrs. Clinton delivered her acceptance speech.

“What was amazing to me was when she was talking about Bernie last night and the camera was on him, he was angry,” said Mr. Trump. “It almost looks like he has buyers remorse, like he shouldn’t have made the deal.”

Mr. Trump also has encountered party unity problems, including opposition for the party establishment and conservative activists.

He was embarrassed by a speech by campaign rival Sen. Ted Cruz at the GOP convention in Cleveland in which the senator failed to endorse him. But the division in the GOP appeared to be narrowing by the end of the convention.

In a separate interview, Mr. Sanders said the real estate tycoon has the wrong impression.

“I always have that look on my face. That’s nothing new. I am not always the smiling kind of guy,” Mr. Sanders said on CBS’s “Face the Nation.”

Mr. Sanders also predicted that the party would fully coalesce around Mrs. Clinton and the “vast majority” of his followers would vote for her.

Many of his supporters formed a Bernie-or-Bust movement. Some vow not to back Mrs. Clinton. Others have quit the Democratic Party or switch allegiance to Green Party candidate Jill Stein.

“We have over 13 million people supporting my candidacy, and I have no doubt that there are some of those people who will not vote for Hillary Clinton,” he said. “[But] as the campaign progresses, and people take a hard look at the issues, who is better for the middle class, who is better for women, who is better for the environment, who is better for the LGBT community — I think more and more of those people will come on board Secretary Clinton’s campaign.”

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