If the OP doesn't get fired, it might be tough for him (her?) to prove that he suffered any damages, a sine qua non of that kind of claim. [1]

[1] E.g., http://www.law.cornell.edu/wex/intentional_interference_with...

I guess. You'd have to demonstrate malice on the part of the recruiter, since simply sharing the fact that the client is looking for work probably isn't independently tortious. I guess I see it, now.