Turkish stocks and the related exchange traded fund stumbled Tuesday on concerns the political situation there is deteriorating as some call for the prime minister’s resignation.

The iShares MSCI Turkey ETF (NYSEArca: TUR) declined 3.7% Tuesday. TUR is down 22.3% over the past three months. [ETF Chart of the Day: Talking Turkey]

The Borsa Instabul 100 Index fell the most since Dec. 25 as opposition leaders called for Prime Minister Recep Tayyip Erdogan’s resignation over a leaked tape where he allegedly talked about hidden funds, Bloomberg reports.

“Either you take a helicopter and flee abroad or resign,” Kemal Kilicdaroglu, head of the Republican People’s Party, told his lawmakers in parliament.

The recording could lead to a “disastrous earthquake capable of annihilating the political establishment that has successfully run the country for 12 years,” Toronto-Dominion Bank senior emerging-markets strategist Cristian Maggio said in a note.

Turkish stocks have weakened since Dec. 17 when a group of businessmen and others were were taken into custody during a probe into gold smuggling, money laundering and bribery in government tenders. [Corruption Charges Ruffle Turkey ETF]