Republican presidential front-runner Donald Trump walked back his proposal to cut taxes for all Americans on Sunday, saying he expects to raise taxes on wealthy Americans.

"By the time it gets negotiated, it's going to be a different plan," Trump told George Stephanopoulos on ABC News' "This Week."

Trump has offered a plan to cut the tax rate for top income earners from 39.6 percent to 25 percent. But he said Sunday that the top rate would be higher than the plan says, explaining his plan is just an opening bid he expects to change.

"They're going down. But by the time it's negotiated, they'll go up," Trump said. "Look, when I'm negotiating with the Democrats, I'm putting in a plan. I'm putting in my optimum plan. It's going to be negotiated, George. It's not going to stay there."

"I will try and keep everything," he said. "What I really want is lower on business, because business, we're the highest-taxed nation in the world. And I want lower on the middle class."

On ABC and in an interview on NBC News, Trump also reversed his past opposition to raising the minimum wage.

"I haven't decided in terms of numbers," Trump said. "But I think people have to get more," Trump said.

"I would like to see an increase of some magnitude," Trump said on NBC's "Meet the Press" Sunday" "But I'd rather leave it to the states."

"People should get more," Trump said. "I don't know how you live on $7.25 an hour."