Democratic presidential hopeful Bernie SandersBernard (Bernie) SandersHarris presses young people to vote early in Iowa trip Dems lower expectations for 'blue wave' Election Countdown: Takeaways from heated Florida governor's debate | DNC chief pushes back on 'blue wave' talk | Manchin faces progressive backlash | Trump heads to Houston rally | Obama in Las Vegas | Signs of huge midterm turnout 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 ClintonHillicon Valley: Bolton tells Russians 2016 meddling had little effect | Facebook eyes major cyber firm | Saudi site gets hacked | Softbank in spotlight over Saudi money | YouTube fights EU 'meme ban' proposal Dems lower expectations for 'blue wave' Election Countdown: Takeaways from heated Florida governor's debate | DNC chief pushes back on 'blue wave' talk | Manchin faces progressive backlash | Trump heads to Houston rally | Obama in Las Vegas | Signs of huge midterm turnout MORE, a former secretary of State and the wife to former President Bill ClintonWilliam (Bill) Jefferson ClintonConservatives bankrolled and dominated Kavanaugh confirmation media campaign Sen. Walter Huddleston was a reminder that immigration used to be a bipartisan issue No, civility isn't optional 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.