An Example of How to Handle Them

"Republicans kept the pressure up on House Speaker Nancy Pelosi on Sunday, with Republican House leader John Boehner saying she should prove her allegation that the CIA lied about waterboarding, or apologize to the nation's intelligence officials.

"I think that she ought to either present the evidence or apologize, one or the other," Boehner (R-Ohio) said..." [link]

They're sort of like puppies. You have to catch them in the act, put their nose in it, then swat their tells.