Democratic presidential hopeful Bernie SandersBernard (Bernie) SandersOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Dems fear lasting damage from Clinton-Sanders fight 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 ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE, a former secretary of State and the wife to former President Bill ClintonBill ClintonGOP rep: North Korea wants Iran-type nuclear deal Lawmakers, pick up the ball on health care and reform Medicaid The art of the small deal 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.