WASHINGTON — A former FBI informant who fabricated a story about President Joe Biden and his son Hunter accepting bribes that became central to Republicans’ impeachment effort was sentenced Wednesday to six years in prison.

Alexander Smirnovpleaded guilty last month in Los Angeles federal court to tax evasion and lying to the FBI about the phony bribery scheme in what prosecutors say was an effort to influence the outcome of the 2020 presidential election.

Smirnov, a dual U.S. and Israeli citizen, falsely claimed to his FBI handler that executives from the Ukrainian energy company Burisma had paid then-Vice President Biden and his son $5 million each around 2015.

Smirnov’s explosive claim in 2020 came after he expressed “bias” about Joe Biden as a presidential candidate, according to prosecutors. In reality, investigators found Smirnov had only routine business dealings with Burisma starting in 2017 — after Biden’s term as vice president.

Prosecutors noted that Smirnov’s false claim “set off a firestorm in Congress” when it resurfaced years later as part of the House impeachment inquiry into President Biden, a Democrat who defeated Republican then-President Donald Trump in 2020. The Biden administration dismissed the House impeachment effort as a “stunt.”

Before Smirnov’s arrest, Republicans had demanded the FBI release the unredacted form documenting the unverified allegations, though they acknowledged they couldn’t confirm if they were true.