Democratic presidential hopeful Bernie SandersBernie SandersLive coverage: California voters to decide Newsom's fate Business groups sense momentum in scaling back Democratic priorities House is no easy road for Biden, Democrats on .5T package 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 ClintonWe must mount an all-country response to help our Afghan allies Biden nominates ex-State Department official as Export-Import Bank leader Obamas, Bushes and Clintons joining new effort to help Afghan refugees MORE, a former secretary of State and the wife to former President Bill ClintonWilliam (Bill) Jefferson ClintonBiden nominates ex-State Department official as Export-Import Bank leader Obamas, Bushes and Clintons joining new effort to help Afghan refugees 9/11 and US-China policy: The geopolitics of distraction 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.