The nations meeting in earthquake-devastated L'Aquila are also likely to consider what actions to take on Iran, North Korea.
Sandy Cane is a member of the Northern League, a party leading the charge against the flow of illegal immigrants to Italy.
Under threat of lengthy jail time, his former chief of staff agreed on Wednesday to be a prosecution witness.
US backs Costa Rica's Arias to mediate the crisis, wary of being seen as interfering in the region – as it has in the past.
In a spectacle befitting the ultimate entertainer, friends and fans pay tribute to a man whose music touched millions worldwide.