House Republicans’ efforts to impeach President Joe Biden have essentially been derailed by the FBI’s arrest of an informant who was central to their allegations, conservative commentator Charlie Sykes said on MSNBC on Friday. The former informant, Alexander Smirnov, reportedly told the FBI that Biden, when he was the vice president, along with his son Hunter, accepted millions of dollars in bribes from executives at the Ukrainian manufacturing conglomerate Burisma to remove a key prosecutor who would investigate them. This turned out to be a lie, and this week, a grand jury indicted Smirnov f…