Federal prosecutors are accusing Rep. William Jefferson (D-La.) of using his position as chairman of the Congressional Black Caucus Foundation to further an additional bribery scheme that was not previously disclosed.

Prosecutors allege Jefferson wrote to a NASA administrator on Congressional Black Caucus Foundation letterhead to ask that it consider doing business with a U.S. rocket technology company.

Jefferson also appeared to link his support for NASA’s budget to the rocket business. In the July 14 letter to NASA, written nearly three weeks before an FBI raid on his home and office, Jefferson wrote of the challenge “of providing the necessary budget resources to NASA, in an era of tight budgets,” according to the prosecutors’ legal document. In the next sentence, the prosecutors wrote, he encouraged NASA to consider the rocket technology company.

The government also alleged that Jefferson asked a lobbyist of an “established” oil services company to pay a family member $10,000 a month in return for his help expanding its business in West Africa. The company did not agree to pay Jefferson’s family member.

Prosecutors are not planning to charge Jefferson for the additional alleged bribery schemes but said they will present evidence about them during Jefferson’s January trial in order to show a pattern of behavior.

Throughout the government’s case against Jefferson, who was indicted in June on racketeering and bribery charges, members of the Congressional Black Caucus have come to his defense, particularly when now-Speaker Nancy Pelosi (D-Calif.) led the charge to remove him from the House Ways and Means Committee last year.

While Jefferson acknowledges that he made “mistakes along the way,” he is fighting the charges.