Donald Trump's frequent change of mind an issue of concern: Bernie Sanders

WASHINGTON: Democrat Bernie Sanders today said that presumptive Republican presidential nominee Donald Trump's frequent change of his position on "virtually every issue" should be an issue of concern for the American people.

"I think this is who Donald Trump is. And I think the American people should be very concerned about somebody who keeps changing his mind, not only on this debate, but on virtually every issue he's been asked about," Sanders said.

"Look, Donald Trump said he wanted to go forward. Then he changed his mind, said no. Then he changed his mind, said yes. Then he changed his, and he said no. Maybe we will get call in five minutes where he will say yes again," Sanders told CBS news.

After initially agreeing to debate with Sanders, Trump has backed out saying the Vermont Senator should instead debate his counterpart in the Democratic party - Hillary Clinton.

Disagreeing with Trump that the Democratic primary process was rigged, Sanders however said the process was "dumb."

"I wouldn't use the word rigged, because we knew what the words were - but what is really dumb is that you have closed primaries, like in New York state, where three million people who are Democrats or Republicans could not participate, where you have situation where over 400 super delegates came on board Clinton's campaign before anybody else was in the race, eight months before the first vote was cast," Sanders said.

"That's not rigged. I think it's just a dumb process which has certainly disadvantaged our campaign," he said.