Business mogul Donald Trump said Sunday that although he can self-finance his campaign, he is open to taking campaign contributions big and small — but that the money he receives will not come with expectations of political favors.

"I would even take big contributors as long as they don't expect anything. Because the only people that can expect something from me is going to be the people that want to see our country be great again,” Trump said on CBS News’ “Face the Nation” in an interview that aired Sunday.

He also said that his campaign has “a lot of money coming in” from small contributors. “A woman sent in $7.23 the other day. It was cute. She wrote this beautiful little letter. It's what she had,” he said.

The Republican presidential candidate has frequently accused his GOP rivals of taking political contributions with expectations attached — and readily admits that he has made such contributions in the past. “I know the people that want something. I've been doing this all my life,” he said.

Trump’s surge to the top of the polls has given him huge influence over the conversation among his GOP rivals. But his free-wheeling style has stirred feuds with several candidates, including former Florida governor Jeb Bush and Wisconsin Gov. Scott Walker.

“The candidates that are running against me — like Jeb Bush, he has no clue. He's never going to be able to do anything. You just looked at what's happened with him over the years and what's happened with — the last thing we need is another Bush,” Trump said on ABC’s “This Week” with George Stephanopoulos. “I think he's a very nice person. If he became president, good luck. It's another Bush. It's going to be the same old story.”

In the same interview, Trump accused Walker of weakening his state’s economy and failing to take firm positions on issues. Critics have accused Walker of flip-flopping on the issue of birthright citizenship, which Trump has said he would end as part of his immigration reform plan.

“Scott Walker has changed his mind now because he keeps going back to his pollster, and his pollster says, ‘Oh, Trump has a good idea. Oh, Trump has a bad idea. Oh, no, wait a minute, Trump has a good idea,' ” Trump said. “These people don't know what they're doing, George. They're politicians.”

The Wisconsin governor, who also appeared on “This Week,” dismissed that criticism. Asked whether he supports altering the 14th Amendment, which grants birthright citizenship, Walker said that "the law is there."

"We need to enforce the laws, including those that are in the Constitution," he said.