2015 was also a few other events notable to Clinton

The Book by Peter Schwiezer "Clinton Cash" released May 2015.

which piggy backed on the NYTimes article (behind a paywall)

https://www.nytimes.com/2015/04/24/us/cash-flowed-to-clinton-foundation-as-russians-pressed-for-control-of-uranium-company.html

Cash Flowed to Clinton Foundation Amid Russian Uranium Deal

July 2015

Judge unseals more details in Jeffrey Epstein underage sex lawsuit

By JOSH GERSTEIN 07/07/2015 10:43 AM EDT

https://www.politico.com/blogs/under-the-radar/2015/07/judge-unseals-more-details-in-jeffrey-epstein-underage-sex-lawsuit-210065

Republicans and conservatives have also taken a keen interest in President Bill Clinton's connections to Epstein, hoping to make trouble for former Secretary of State Hillary Clinton's presidential bid. Press reports have noted that Bill Clinton, as well as actors Kevin Spacey and Chris Tucker, used Epstein's private 727 to travel to Africa in 2002 for a Clinton Foundation tour of AIDS-fighting and development work. Flight logs filed in connection with another lawsuit show at least 10 journeys by Clinton on Epstein's planes.

"I'd like to know what he was doing with Jeffrey Epstein, how many trips did he take, where was he going, what did he do when he was with this guy?' Republican National Committee chairman Reince Priebus told Bloomberg in March. "When you hang out with a guy who has a reputation like Jeffrey Epstein, multiple times, on private jets, on weekends, on trips, on places at least where it's been reported not very good things happen, it would be good to know what our former president was doing, especially because it appears he's going to be part of a campaign ticket on the other side of the aisle."

Last month, conservative watchdog group Judicial Watch filed a Freedom of Information Act lawsuit demanding all Secret Service records pertaining to the costs of any trips Bill Clinton made to Epstein's private island in the Caribbean