It has been said that Bush and Clinton get their money from the same people
Remember how George H. W. Bush and Bill Clinton reached out to each other after the 2004 tsunami in Asia? Of course it was all for charity and helping the poor afflicted victims of the disaster. sarc.
I personally believe it was a deal between the two families like Hillary was supposed to be the next candidate in 2008 and then JEB was supposed to be the Republican candidate in 2016. I think maybe Bush Sr. urged McCain to run in 2008 to lose to Hillary but things didn’t turn out as planned.