McCain has a foul temper and mouth to match.
McCain: A Question of Temperament

McCain was involved in the Keating Five.
Keating Five - Wikipedia, the free encyclopedia
Is John McCain a Crook? - Chris Suellentrop - Slate Magazine

He spent his 70th. birthday on Raffaello Follieri's yacht. Follieri was convicted this week of 14 counts of wire fraud, money laundering and conspiracy.
Anne Hathaway's ex-boyfriend Raffaello Follieri pleads guilty to scam - Telegraph