Bernie Sanders said he'd like to see a debate take place in New York. | Getty Sanders worried Clinton won't debate

Sen. Bernie Sanders said Sunday that he wants to have a debate with former Secretary of State Hillary Clinton ahead of the April 19 New York presidential primary, but he is worried that Clinton, once the state's senator, does not.

"Yeah, I do have a little bit of concern about that," Sanders said on NBC's "Meet the Press," after easily winning Saturday in Alaska, Hawaii and Washington. "But I certainly would like to see a debate in New York state."


Sanders declined to say what his conditions would be to support Clinton as the Democrats' presidential nominee, telling host Chuck Todd, "I hope very much, Chuck, that you will be asking her that question."

While Clinton continues to lead Sanders in delegates, the Vermont senator said "a lot of the superdelegates are now beginning to look at which Democratic candidate is in the best place to defeat Donald Trump."

"I think some of them are beginning to understand that it's Bernie Sanders," he added.

Sanders was asked about his rallies and booing aimed at Clinton. Todd said the last time Sanders tried to chastise his supporters for lashing out against her was Feb. 23.

Sanders said there was "no reason at all" that he had not tried to stop them in the past few weeks.

"You know, every day we are in different position here," he said. "I respect Secretary Clinton. I don't want our supporters to be booing her. But there are real differences of opinion."