DETROIT -- A congresswoman who is the mother of Detroit's former mayor said she's received a subpoena to testify at a grand jury and will "cooperate fully."

U.S. Rep. Carolyn Cheeks Kilpatrick issued a statement Thursday, saying she and office manager Andrea Bragg are not targets of the grand jury in Detroit. She said she will answer "all appropriate questions."

"Beyond that, as this is a grand jury matter, this office will have no further comment,” the statement read.

Notice of her subpoena was in Wednesday's Congressional Record. Kilpatrick, D-Mich., didn't indicate when she goes to the grand jury.

Federal authorities in Detroit have been using a grand jury to investigate corruption in city government during Kwame Kilpatrick's tenure as mayor. He hasn't been charged, but nine people have pleaded guilty, including two high-ranking aides and ex-councilwoman Monica Conyers.

"It has become a perfect storm of who is going to go next," said Detroit political consultant Adolph Mongo.

Kwame Kilpatrick resigned in 2008 after pleading guilty to obstructing justice in a civil lawsuit in state court, a scandal that revealed a passionate affair with his chief of staff. He was ordered to pay $1 million to the city but recently missed a deadline to make a $79,011 payment and has been charged with violating probation.

Spokesman Mike Paul said Thursday the former mayor would not comment on his mother's subpoena. Kwame Kilpatrick was in Wayne County court in Detroit trying to get a judge disqualified from overseeing his probation case. He failed and faces a hearing on March 24.

Rep. Kilpatrick, 64, has been in Congress since 1997 and is the former chair of the Congressional Black Caucus.

She was scheduled to be in Washington for a subcommittee meeting but she wasn't there.