Attorney General Alberto R. Gonzales, the F.B.I. director, Robert S. Mueller III, and senior officials and career prosecutors at the Justice Department told associates this week that they were prepared to quit if the White House directed them to relinquish evidence seized in a bitterly disputed search of a House member's office, government officials said Friday. Mr. Gonzales was joined in raising the possibility of resignation by the deputy attorney general, Paul J. McNulty, the officials said. Mr. Gonzales and Mr. McNulty told associates that they had an obligation to protect evidence in a criminal case and would be unwilling...