"We need to get a national consensus around the pre-conditions for the next step forward. The president must stay in office to steer those changes," [Wisner] told the Munich Security Conference on Saturday.
"I believe that President Mubarak's continued leadership is critical - it's his chance to write his own legacy.
"He has given 60 years of his life to the service of his country, this is an ideal moment for him to show the way forward."
But in Washington, state department spokesman PJ Crowley said: "We have great respect for Frank Wisner and we were deeply appreciative of his willingness to travel to Egypt last week."
"He has not continued in any official capacity following the trip. The views he expressed today are his own. He did not co-ordinate his comments with the US government."
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