Charles McGonigal, a former FBI official involved in the investigation of Donald Trump’s ties to Russia, has been charged with violating sanctions and collaborating with Russian oligarch Oleg Deripaska, the Department of Justice announced Monday.

According to federal prosecutors, McGonigal received “concealed payments” from a Russian intelligence officer in exchange for his help in having sanctions targeting Deripaska lifted. McGonigal is being charged by the Federal District in Manhattan with additional counts relating to money laundering and conspiracy.

“Charles McGonigal, a former high-level FBI official, and Sergey Shestakov, a Court interpreter, violated U.S. sanctions by agreeing to provide services to Oleg Deripaska, a sanctioned Russian oligarch.  They both previously worked with Deripaska to attempt to have his sanctions removed, and, as public servants, they should have known better,” U.S. Attorney Damian Williams wrote in a statement released Monday.

As chief of counterintelligence in the bureau’s New York City field office, McGonigal was among the first FBI officials to learn of the fateful conversation between a senior Trump campaign adviser and a foreign diplomat over the topic of Hillary Clinton’s emails, the Washington Free Beacon noted. Knowledge of that interaction proved crucial to the federal agency opening an investigation into the matter, which ultimately found there was no evidence of collusion between the Trump campaign and Russia.