"I do question her judgement," Sanders told the Brooklyn audience in response to a question about a remark he made last week that she was not qualified to be president.

That remark dominated the news cycle for two days, and Sanders eventually backtracked on the remark.

At Thursday's debate in Brooklyn, just days before New York's primary on April 19, the Vermont senator seemed determined to get his criticism of Clinton just right.

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Sanders said Clinton was "of course" qualifed to be president given her years of public service, but then criticized her positions on a host of issues.

"I question her judgement voting for the war in Iraq, the worst foreign policy in the history of this country," he said.

He then went on to attack the former first lady for voting for "virtually every disastrous trade agreement."

"And I question her judgement," he added, "about running super-PACs which are collecting tens of millions of dollars from special interests including $15 million from Wall Street."

Clinton responded by saying that the voters of New York has trusted her judgment enough to elect her to two terms in the Senate, and that President Obama had trusted her enough to name her as his secretary of State.