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In May 2008, FBI agents raided OSC offices and Mr. Bloch’s home, seizing computers and computer files, in what reports at the time said was an investigation into whether Mr. Bloch had criminally obstructed the OPM probe.

In a letter to the president, Mr. Bloch said that his office had “made unprecedented progress in eliminating case backlogs by previous administrations” and that he had protected members of the U.S. military from job discrimination while they were deployed overseas.

“As you well know, doing the right thing can result in much criticism and controversy from every side,” Mr. Bloch wrote in his letter to Mr. Bush. “I am proud to have enforced your stated policy goal of upholding the rule of law, enforcing the law as it was written, not according to fads or special interest pressure.”