Supporters of Democratic presidential candidate Bernie SandersBernie SandersSanders endorses more than 150 down-ballot Democrats Postal service crisis — California is ready to pilot a postal banking solution Daily Beast reporter: Progressives feel alienated after Biden's socialism jab 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 ObamaBarack Hussein ObamaTrump calls into Rush Limbaugh's show for two hours World Food Programme's Nobel: Why the UN, NATO and alliances matter in this election Poll shows Biden leading Trump, tight House race in key Nebraska district MORE objectively than Hillary ClintonHillary Diane Rodham ClintonJudge's ruling puts competitive Minnesota House race back on track for November The Memo: Trump searches for path to comeback Overnight Defense: Trump sows confusion over Afghanistan troop levels | Trump tells Iran not to 'f--- around' with US | Supervisor of soldiers who appeared at Democratic convention faces discipline 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 TrumpDonald John TrumpFederal judge shoots down Texas proclamation allowing one ballot drop-off location per county Nine people who attended Trump rally in Minnesota contracted coronavirus Schiff: If Trump wanted more infections 'would he be doing anything different?' 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."