The second attorney general under the Bush Administration, Alberto Gonzalez, has resigned. Gonzalez had come under fire from Congress for a series of firings and faced a possible perjury investigation. Bush is not expected to name a successor today.

Gonzalez will formally announce his resignation at 10:30 a.m. and President Bush will hold a press conference at 11:50 a.m.

The embattled attorney general had withstood months of criticism from both sides of the aisle in Congress for a variety of missteps. Lawmakers blasted Gonzales after his department fired at least nine U.S. attorneys last year and accused him of misusing terrorist surveillance programs. Most recently Democrats charged that Gonzales had repeatedly lied to Congress under oath.

Throughout Gonzales’ sometimes rocky tenure, President Bush had defended him, accusing his detractors of playing politics. The New York Times reported Friday that Gonzales submitted his resignation to the president by phone Friday morning.

Bush has yet to announce a replacement for the attorney general position, but The Associated Press reports a likely temporary replacement for Gonzales is Solicitor General Paul Clement, according to a senior department official.

There are also reports that Homeland Security Secretary Michael Chertoff will be named as a successor to Gonzales. [PIERRE THOMAS, JASON RYAN, THERESA COOK and JACK DATE - ABC News]