CNN  —  The Justice Department will review its case against a former FBI informant who was convicted of lying about the Biden family’s ties to Ukraine, prosecutors said in a court filing Thursday. Alexander Smirnov was sentenced to six years in prison for falsely telling FBI agents in 2020 that President Joe Biden and his son Hunter Biden had taken a $10 million bribe from Burisma, a Ukrainian energy company. Smirnov’s story became central to the Republican-led effort to impeach then-President