Turkey's Finance Minister Mehmet Simsek promised to do "whatever it takes" to stabilize financial markets, according to people who joined a teleconference organized by Citigroup Inc. and Deutsche Bank. Simsek's comment follow last week’s detention and later arrest of Istanbul Mayor Ekrem Imamoglu, President Recep Tayyip Erdogan’s key political rival. Bloomberg's Beril Akman reports. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don'