Senators today questioned former judge Michael Mukasey, President Bush's choice to become Attorney General of the United States. They were looking for differences between Mukasey and Alberto Gonzales, who resigned under the pressure of relentless controversy. The issues explored included interrogation techniques, conversations with political figures about pending cases and a willingness to resign if the president ignores legal or ethical problems about his policies. Keith Perine covers legal affairs for Congressional Quarterly magazine.