Supporters of Democratic presidential candidate Bernie SandersBernie SandersSymone Sanders to leave the White House at the end of the year Briahna Joy Gray says Chris Cuomo will return to CNN following scandal Postal Service expansion into banking services misguided 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 ObamaBarack Hussein ObamaThose on the front lines of climate change should be empowered to be central to its solution The Memo: Trump's justices look set to restrict abortion Minorities and women are leading the red wave MORE’s accomplishments during his time in office.

“If you look at what Bernie Sanders is saying, he’s far more critical of Barack Obama objectively than Hillary ClintonHillary Diane Rodham ClintonBudowsky: Why GOP donors flock to Manchin and Sinema Countering the ongoing Republican delusion Republicans seem set to win the midterms — unless they defeat themselves 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 TrumpMedia giants side with Bannon on request to release Jan. 6 documents Cheney warns of consequences for Trump in dealings with Jan. 6 committee Jan. 6 panel recommends contempt charges for Trump DOJ official 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."