Update Dec 28th 2017, Turkey has resumed the issuance of e-visas for both Tourist and Business travel.
The Turkish embassy has announced visa issuance will resume for U.S. citizens on a limited basis at the Turkish Embassy in Washington DC.
We will post additional information as it becomes available.
Nov 20th, The Turkish Embassy in Washington DC has begin to issue both Tourist and Business visas to U.S. citizens, the excepted processing time will be 5-7 business days.
At this time e-Visas to Turkey for U.S. citizens are not being granted only the traditional stamped visa type is being issued.
News Article: The Points Guy