"Kofi Annan was a guiding force for good... In many ways, Kofi Annan was the United Nations," said current U.N. chief António Guterres.
The collapse "lacerated the heart of Genoa," said the city's archbishop, Cardinal Angelo Bagnasco.
Opposition parties have held regular protests since last month's election, alleging vote rigging by the powerful security establishment.
He insists he will put funny business aside.
Mueller did not recommend any specific sentence. The filing says Papadopoulos' "false statements were intended to harm the investigation, and did so."