President Bush has ordered White House staff to attend mandatory briefings beginning next week on ethical behavior and the handling of classified material after the indictment last week of a senior administration official in the CIA leak probe.

According to a memo sent to aides yesterday, Bush expects all White House staff to adhere to the "spirit as well as the letter" of all ethics laws and rules. As a result, "the White House counsel's office will conduct a series of presentations next week that will provide refresher lectures on general ethics rules, including the rules of governing the protection of classified information," according to the memo, a copy of which was provided to The Washington Post by a senior White House aide.