The hole just keeps getting deeper for Rep. Chaka Fattah (D-Philadelphia).

Fattah’s district office manager, Dolores Ridley, has been subpoenaed in a criminal case against the Philadelphia Congressman. Ridley is being asked to give “grand jury testimony in a criminal case” by the U.S. District Court for the Eastern District of Pennsylvania.

As is required, Ridley notified House Speaker John Boehner of the subpoena in a Jan. 16 message.

Fattah has never directly been charged with anything and has insisted he has never done anything illegal. But for years, the Congressman has been under investigation. A tax record review by the Daily News in October found that nonprofits backed by Fattah have paid out at least $5.8 million to the Congressman’s associates, including former staffers.

Two of his longtime political aides, including his former Chief of Staff Gregory Naylor, have even pleaded guilty to campaign finance fraud.

In August, Naylor admitted to concealing the scheme, in which Fattah directed him and other staffers to steal money from non-profit grants to repay an illegal campaign loan.

Another of Fattah’s political aides, one of his top aides on the House Appropriations Committee, was subpoenaed last year, along with documents from Fattah’s office.

And there’s been no better luck for Fattah’s son. Chaka Fattah Jr. was indicted in August on counts of tax and bank fraud. Fattah Jr. is representing himself during the trial.