Supporters of Democratic presidential candidate Bernie SandersBernie SandersSanders: Trump was right about 'trying to end endless wars' Democrats battle over best path for Puerto Rico Bernie Sanders says he disagrees with Tlaib's call for 'no more police' 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 ObamaBiden can make history on nuclear arms reductions Biden has nearly 90-point approval gap between Democrats, Republicans: poll The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring MORE objectively than Hillary ClintonHillary Diane Rodham ClintonChelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' Why does Bernie Sanders want to quash Elon Musk's dreams? Republican legislators target private sector election grants 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 TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he 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."