US Democratic presidential candidate Bernie Sanders has said he will meet with his rival, Hillary Clinton, on Tuesday to press her to embrace his progressive agenda, saying he wants to know what she will stand for if she becomes president.

Speaking on ABC America's This Week program on Sunday, Senator Sanders said he and Mrs Clinton would discuss "if she wins, what kind of administration she will have".

However, Mr Sanders did not concede he had lost the Democratic presidential nomination to Mrs Clinton, who is leading in Democratic primaries and is the party's presumed nominee.

"What I need to see is a commitment that there will be progressive taxation," he said, saying corporations and billionaires should pay higher tax rates.

He repeated his stance that he would do "everything I can" to ensure Donald Trump, the presumptive Republican nominee, would not become president.

Senator Sanders said he wanted to see Mrs Clinton embrace his view that healthcare should be a universal right in America and public universities should offer education for free.

"Will she go as far as I would like her to go? No, she won't," he said.

"But I think millions of people want to understand and see what kind of commitment she has to addressing the real crises in the country."

Reuters