Washington (CNN) In a Fox News interview that aired on Monday, host Tucker Carlson asked President Donald Trump about problems on the streets of American cities, such as public urination, visible "junkies" and general "filth."

Trump then began musing about homelessness, though he never used that word. During his remarks, he seemed to suggest that he had taken dramatic action at some point in 2017 to deal with homeless people in Washington, DC.

"You know, I had a situation when I first became president, we had certain areas of Washington, DC, where that was starting to happen, and I ended it very quickly. I said, 'You can't do that.' When we have leaders of the world coming in to see the President of the United States and they're riding down a highway, they can't be looking at that. I really believe that it hurts our country. They can't be looking at scenes like you see in Los Angeles and San Francisco."

This is a difficult claim to fact check, since it's unclear what precisely Trump was referencing and since the White House has not responded to CNN's request for clarification. So we can't definitively say that Trump is wrong.

We can say that Trump has provided no proof. And we can report that those who work with homeless people in Washington say that they know of no reason to believe the claim is true.

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