(CNN) — Federal prosecutors alleged in a new court filing Wednesday that Hunter Biden agreed to lobby US officials on behalf of a Romanian businessman facing criminal investigations back home.

The new accusation came from special counsel David Weiss, who is prosecuting Hunter Biden for alleged tax evasion. The case, scheduled for trial in September, touches on many of Hunter Biden’s controversial foreign business dealings, sometimes while his father was in office.

However, prosecutors haven’t charged Hunter Biden with any foreign lobbying crimes, though they investigated him for years on that front. They signaled in the new filing that they want to introduce new testimony about the alleged lobbying agreement as evidence in the tax case.

Weiss’ team said Hunter Biden “agreed to attempt

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