WASHINGTON — Presumptive Republican presidential nominee Donald Trump said in television interviews broadcast Sunday that he would like an increase in the minimum wage and that it is best that such a change happen at the state level.

In the past, Trump has opposed raising the minimum wage. But in recent days, he has increasingly warmed to the idea.

“I have seen what’s going on, and I don’t know how people make it on $7.25,’’ Trump said on NBC’s “Meet the Press,’’ referring to the federal minimum hourly wage. “I would like to see an increase of some magnitude, but I’d rather leave it to the states. Let the states decide.’’

Speaking on ABC’s “This Week With George Stephanopoulos,’’ the business mogul said, “I haven’t decided in terms of numbers, but I think people have to get more.’’

He acknowledged that he was adopting a position at odds with his previous stance. “Sure, it’s a change. I’m allowed to change. You need flexibility,’’ he said.

In a GOP presidential debate in November, Trump was asked about calls to increase the minimum wage and responded: “Taxes too high, wages too high. We’re not going to be able to compete against the world,’’ he said. “I hate to say it, but we have to leave it the way it is.’’

In another apparent switch, Trump also predicted that once his tax plan — which would give tax cuts to the wealthy — is negotiated in the legislative process, it will actually prompt some increases in taxes for the rich.

“In my plan, they are going down, but by the time it’s negotiated, they’ll go up,’’ he said on “This Week.’’

In the interviews, Trump weighed in on House Speaker Paul D. Ryan’s announcement last week that he was not ready to back the businessman. The two are slated to meet Thursday.

Asked on “Meet the Press’’ whether Ryan of Wisconsin should be chairman of the Republican National Convention if he cannot endorse him, Trump left open the possibility of trying to dislodge the speaker from that position.

Trump said there could be consequences if Ryan continues to withhold his support.

“I will give you a very solid answer, if that happens, about one minute after that happens, OK?’’ Trump said. “There’s no reason to give it right now, but I’ll be very quick with the answer.’’

Trump added that Jeb Bush was “not honorable’’ for breaking his promise to endorse the party’s nominee. Trump said Mitt Romney was “ungrateful’’ for the help he gave him in the 2012 election.

Trump also referred to South Carolina Senator Lindsey Graham as “this lightweight.’’ Graham said Friday that he would never vote for Trump.

Of Ryan, he said: “I’d like to have his support. But if he doesn’t want to support me, that’s fine, and we have to go about it.’’

Some prominent supporters of Trump have criticized Ryan for declining to issue an immediate endorsement.

Sarah Palin, the former Alaska governor, said in an interview on CNN’s “State of the Union’’ that Ryan would be “Cantored,’’ a reference to former Representative Eric Cantor of Virginia, who was in line to be speaker of the House before losing reelection in a Republican primary in 2014.

On Sunday, the 2008 nominee, Arizona Senator John McCain, said “a lot of things would have to happen’’ before he’d campaign for Trump.

He called on Trump to apologize for belittling comments made in 2015. Campaigning in Iowa in July, Trump said McCain, a naval aviator shot down during the Vietnam War and held as a prisoner of war for five years, was “not a war hero.’’

“It’s important for Donald Trump to express his appreciation for veterans — not John McCain, but veterans who were incarcerated as prisoners of war,’’ McCain said.

In the ABC interview, Trump suggested that not having support from senior leaders of the Republican Party might just be another thing that sets him apart.

“Does it have to be unified? I’m very different than everybody else, perhaps, that’s ever run for office. I actually don’t think so,’’ Trump said.

As Trump moves ahead on picking a running mate, former Arizona Governor Jan Brewer said Sunday on the CNN program that she would “of course’’ be willing to be considered.

On CBS’s “Face the Nation,’’ Democratic front-runner Hillary Clinton expanded on her labeling of Trump as a “loose cannon,’’ saying she was talking about his policy agenda and his comments on the campaign trail.

“I am talking about what he has said in this campaign, and continues to say, and the kind of agenda he’s putting forth for our country, which, obviously, I think would, you know, not be in the best interest,’’ Clinton said.