Democratic presidential hopeful Bernie SandersBernie SandersHillicon Valley: Amazon wins union election — says 'our employees made the choice' On The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists 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 ClintonClose the avenues of foreign meddling Pelosi planned on retiring until Trump won election: report Pence autobiography coming from Simon & Schuster MORE, a former secretary of State and the wife to former President Bill ClintonWilliam (Bill) Jefferson Clinton Boehner on Clinton impeachment: 'I regret that I didn't fight against it' 'Matt Gaetz wants to date your child' billboard appears in Florida The strategy Biden needs to pass his infrastructure plan 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.