>> Turkey's president, Tayyip Erdogan, has gained the upper hand over an old rival. But the man he accuses of an attempted coup earlier this month, US-based cleric, Fethullah Gülen, was once an ally. Reuter's reporter, Ayla Jean Yackley, says the two men want the same conservative Islamist direction for Turkey.
>> So, after President Tayyip Erdogan, first as Prime Minister, became elected, Fetullah Gulan and his followers are said to have assumed much more prominent roles in government, in the state bureaucracy, the judiciary. And as we're now learning, with this investigation into the coup plot, followers of Fethullah Gulen, are said to have assumed prominent roles inside the military, once a bastion of secularism here in Turkey.
>> It happened under Erdogan's nose. At first, he leaned on Gulen for support against the secular army. The cleric had been around a long time, building a network of schools, the relationship souring from around 2012. Experts say both men are after power, and by purging 60,000 alleged Gulen loyalists, Erdogan may have prevailed.
>> This is on a scale of something we've never really seen before in Turkey. These numbers are astounding. 60,000. People both within the movement and without say this is the effective end of the Gulen movement in Turkey.>> Now, even opposition parties rally in support of Erdogan. The president saying he's cleansing Turkey of a virus.
Gulen supporters, never open, going deeper underground.