Bernie Sanders Bernard (Bernie) SandersSenate Dems seek to turn tables on GOP in climate change fight Bernie Sanders Town Hall finishes third in cable news race, draws 1.4 million viewers Woman to undecided Biden: 'Just say yes' to 2020 bid MORE got his biggest cheer of Sunday night’s presidential debate in Flint, Mich., when he suggested the Republican debates were the result of rampant mental health problems.

“We are, if elected president, going to invest a lot of money into mental health,” Sanders told the Democratic debate audience.

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“And when you watch these Republican debates, you know why we need to invest in mental health.”

The audience cheered loudly at the line, and Sanders’s rival on stage, Hillary Clinton Hillary Diane Rodham ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' MORE, laughed loudly.

Clinton gave Sanders the opening for his zinger when she said, “We have our differences, and we get into vigorous debate about issues. But compare the substance of this debate with what you saw on the Republican stage last week.”

Thursday night’s GOP debates included a lot of name-calling and a moment in which front-runner Donald Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE defended the size of his hands.