Democratic presidential hopeful Bernie SandersBernard (Bernie) SandersSchumer: Franken should resign Franken resignation could upend Minnesota races Avalanche of Democratic senators say Franken should resign MORE criticized the Clinton Foundation for accepting donations from foreign governments in an interview aired Sunday, calling it a conflict of interest. 

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"Do I have a problem when a sitting secretary of State and a foundation run by her husband collects many, many dollars from foreign governments — governments which are dictatorships?

"Yeah, I do have a problem with that. Yeah, I do," Sanders said on CNN's "State of the Union." 

When host Jake Tapper asked if he thought it was a conflict of interest, Sanders said, "I do."

Sanders and Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE, a former secretary of State and the wife to former President Bill ClintonWilliam (Bill) Jefferson ClintonMueller’s probe doesn't end with a bang, but with a whimper Mark Mellman: History’s judgment Congress should massively ramp up funding for the NIH MORE, are locked in a tight battle ahead of Tuesday's presidential primaries.

The Clinton Foundation, a nonprofit established by Bill Clinton to implement development programs in third-world countries, has received donations from countries including Saudi Arabia. The kingdom gave between $10 million and $25 million to the foundation between the time the foundation was created through 2014, according to Politifact, though it stopped giving when she was secretary of State.