Supporters of Democratic presidential candidate Bernie SandersBernard (Bernie) SandersOcasio-Cortez on call to run for president: ‘How about … no’ GOP-controlled Senate breaks with Trump on Saudi vote Amazon workers in Staten Island launching campaign to unionize 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 ObamaChina’s educational offensive in African markets Democrats have major policy dilemma with new Congress Booker's potential 2020 bid is generating buzz among Democratic activists, says political reporter MORE objectively than Hillary ClintonHillary Diane Rodham ClintonCohen once teased Hillary Clinton about going to prison. Now he's been sentenced to 36 months The Hill's 12:30 Report — Cohen gets three years in prison | Fallout from Oval Office clash | House GOP eyes vote on B for wall Contest offers 'Broadway play and chardonnay' with Clinton 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 TrumpActivists highlight Trump ties to foreign autocrats in hotel light display Jose Canseco pitches Trump for chief of staff: ‘Worried about you looking more like a Twinkie everyday’ Dershowitz: Mueller's report will contain 'sins' but no 'impeachable offense' 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."