LAS VEGAS (AP) — Prosecutors say a former FBI informant charged with making up a multimillion-dollar bribery scheme involving President Joe Biden, his son Hunter and a Ukrainian energy company had contacts with officials affiliated with Russian intelligence.

Prosecutors said that in a court filing urging a judge to keep Alexander Smirnov behind bars while he awaits trial.

He is charged with falsely reporting to the FBI in June 2020 that executives associated with the Ukrainian energy company Burisma paid Hunter and Joe Biden $5 million each in 2015 or 2016.

Smirnov is due in court later Tuesday in Las Vegas.