The arrest of the Biden “informant” at the heart of the GOP’s impeachment effort is essentially a death blow to the whole endeavor, former Rep. Carlos Curbelo (R-FL) told MSNBC guest host and former RNC chair Michael Steele on Thursday. The informant, Alexander Smirnov, had told FBI agents that President Joe Biden and his son Hunter accepted millions in bribes from Ukrainian firm Burisma at the time Biden was vice president. But the FBI now admits to this being a fabrication planted by Russian officials. “You have Jim Jordan, and James Comer acting like this is no big deal, it is no big deal t…