Fethullah Gülen
U.S.-based Muslim cleric Fethullah Gulen is a foe of Turkish President Tayyip Erdogan.
The alleged plan emerged during Mueller’s wider investigation of possible Russian interference in the 2016 presidential election.
Investigators have also reportedly questioned witnesses about whether Flynn was secretly paid by the Turkish government.
WHAT'S HAPPENING
Turkey wants the U.S. to take its concerns seriously. The mayor of Ankara isn’t helping.
So far, there's no sign that's happening.
The Turkish President wants better ties and an extradition of exiled cleric Fethullah Gulen.
Prime Minister Binali Yildirim says U.S. Vice President Joe Biden will visit Turkey this month, but there's "no room for negotiation" on the cleric.