Supporters of Democratic presidential candidate Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE are unrealistic about what the independent Vermont senator can achieve if elected president, former Rep. Barney Frank (D-Mass.) argued Monday.

“I think it is a lack of information, to be honest,” he said on “MSNBC Live with Jose Diaz-Balart” when asked why Sanders is resonating with voters.

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“You have people, I believe, who do not understand how hard it is to make change. [It is] the importance of not just being idealistic, but being sensibly pragmatic and keeping their ideals. Sanders is getting their support.”

Frank said some of the voters who are frustrated with the Democratic establishment have unrealistic expectations about what a president can deliver.

“You have people who don’t understand, frankly, the nature of the American political system,” he said. "It’s the separation of powers.

“It takes — because of the Constitution, not because of any one individual — two elections to get a governing majority in America,” added Frank, who has endorsed Clinton.

“People are reluctant to blame themselves, [and] people like to find somebody else to blame, so now they’re saying, 'Sanders pointed out it’s the system’s fault.' I think that’s unfortunate.”

Frank criticized Sanders for repeatedly challenging President Obama’s accomplishments during his time in office.

“If you look at what Bernie Sanders is saying, he’s far more critical of Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE objectively than Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE,” he said. "The healthcare bill — that’s President Obama. His view on the inadequacy of financial reform is President Obama.”

Frank added that he thinks GOP presidential front-runner Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s campaign is losing steam with voters.

“I’m afraid Trump’s collapsing more quickly than I had hoped because he’d be a great one to run against. Although it’s a good sign he’s collapsing, because of America."