A former FBI informant who admitted to lying about U.S. President Joe Biden and his son Hunter Biden’s interactions with a Ukrainian energy company was sentenced to six years in prison on Wednesday, court records showed.

Alexander Smirnov may not be a household name, but his prison sentence represents a stunning fiasco for some prominent Republicans in Congress.

Alexander Smirnov falsely claimed to his FBI handler that executives from the Ukrainian energy company Burisma paid Biden and his son $5 million each around 2015.

Alexander Smirnov, a dual U.S. and Israeli citizen, pleaded guilty in a Los Angeles federal court to charges of tax evasion and lying to the FBI.

No evidence emerged that the allegations against the Bidens were true, but the story was taken up by some Republicans, who made the unverified claims part of their effort to impeach President