05/09/2015 11:45 am ET Updated May 09, 2015

Investigation Of Close Ally Gives Marco Rubio A Quandary

Scott Olson via Getty Images

As an underdog candidate for the U.S. Senate going nowhere in the polls, Marco Rubio thought about dropping out. Then his close friend David Rivera showed up at his house, armed with giant sticky notes to paste reasons not to quit all over Rubio’s living room.

But now, as Rubio pursues another audacious, uphill campaign, this time for the Republican presidential nomination, the man he has called his “most loyal friend and supporter” could be a big political problem.

Read more on The Washington Post