WASHINGTON (AP) _ Former LBJ White House aide E. Barrett Prettyman Jr. was picked Tuesday as interim head of an investigation into alleged corruption in the District of Columbia police department, which has been accused of cronyism, mismanagement and some criminal activity.

``I have no axes to grind. I have no hidden agenda. I have only one objective and that is to restore confidence in the police department,'' Prettyman said.

City leaders said Prettyman will be named acting inspector general for the nation's capital. A lifelong Washington resident, Prettyman agreed to take the job on a temporary basis while local leaders conduct a nationwide search for a permanent inspector general.

``I plan to devote my full time and my full energy,'' said Prettyman, who will take a leave of absence from his job as a senior partner with the Washington law firm of Hogan and Hartson.

Prettyman served as a White House assistant to former President Johnson and was counsel to the House Ethics committee in the 1980s during the Abscam investigation of congressional corruption. He was the first president of the D.C. Bar Association.