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Bernie Sanders has a new book out, and Bill O'Reilly's been trying to get him on The Factor for quite a while.

The Vermont senator has refused, so O'Reilly sent Jesse Watters to ask him about it at a recent New York City book signing.

First, Jesse interacted with some Sanders supporters outside, including one who was not so happy to see him.

Then, Jesse ventured into the Barnes & Noble to seek out the senator, who didn't look too upset to see Jesse ... again

But Sanders' aides and security were not far behind and Watters was soon on his way out. 

Still no word on a Sanders vs. O'Reilly debate on The Factor. Watch the full Watters' World clip above...

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