A senior Senate Democratic leadership aide tells Fox that there have been threats made against the Senate Parliamentarian, Alan Frumin, who has come to prominence in the health care debate as he has weighed GOP challenges to reconciliation legislation.  

In an off cam talk with Budget Committee Chairman Kent Conrad, D-ND, the senator referred to those threats, noting the irony in them.

"The irony here is that he has people threatening him, but here's a guy who's held against us," Conrad said, referring to Frumin's ruling Wednesday night that will effectively send the bill back to the House because of minor changes.

As far as threats to senators, none were apparent, according to leadership aides, but Wednesday, in a memo to members and their staffs, Senate Sergeant at Arms Terrance Gainer exhorted members to "remain vigilant."

Conrad deferred a question about whether or not he had been threatened or knew of threats. "The understanding with the Capitol Police is that you never talk about the threats."