More developments in the U.S. attorney scandal — investigative journalist Murray Waas is reporting the Bush administration has withheld emails showing senior White House and Justice Department officials collaborated to conceal the role of White House strategist Karl Rove in installing his former deputy Timothy Griffin as U.S. attorney in Arkansas. The emails show Attorney General Alberto Gonzales’ former chief of staff, D. Kyle Sampson, worked with White House officials on two letters that misled Congress on the appointment and Rove’s role.