Peter Kenyon

Turkish voters will decide Sunday whether to replace the Turkish Republic's parliamentary form of government with a strong presidency. It's a vote that could alter — or, opponents say, endanger — the democratic traditions of this key U.S. ally. Turkey is a NATO member helping fight ISIS.

If the referendum passes, it will increase the power of President Recep Tayyip Erdogan. Polls released late in the campaign showed a narrow lead for "yes," with a large number still declaring themselves undecided. Erdogan is predicting at least a 55 percent margin for "yes."

A late March snow descends on a modest farmhouse in central Anatolia. An oil stove hisses away inside, as afternoon gives way to twilight.

A heavyset man with a thick black mustache adjusts his cap, takes a deep breath and fills the room with a piercing, impassioned cry. The small audience settles back for an evening of traditional dengbej singing.

For centuries, dengbej songs served as a combination news bulletin, history lesson and evening's entertainment. Master singers built up large repertoires of songs — and could recite the historical events they describe.

During his first trip to Turkey as secretary of state, Rex Tillerson said the U.S. and its NATO ally were struggling with "difficult choices" on a strategy to defeat the Islamic State in Syria.

The U.S. has been trying to balance its reliance on Turkey in the fight against ISIS with its support for Kurdish fighters in northern Syria — which infuriates Turkey. Tillerson said he and Turkish leaders discussed options for how to clear the extremist group from its remaining strongholds, such as Raqqa, and stabilize those areas.

President Trump's revised travel ban – which suspends visas from six predominantly Muslim countries and suspends refugee admittances – was to have gone into effect at 12:01 a.m. March 16, before a court in Hawaii blocked it on Wednesday.

This spring, voters in Turkey are being asked if they want to transform their government, giving broader executive powers to President Recep Tayyip Erdogan. Opposition parties say the proposed constitutional changes would put Turkey on the road to one-man rule, but supporters say in these dangerous times, Turkey needs a strong leader to fend off enemies at home and abroad.

The vote is expected in April, and the government is already in campaign mode, trumpeting its accomplishments and promising more if the referendum is approved.

In the days leading up to today's announcement of additional U.S. sanctions on Iran, the U.S. and Iran have made claims and counter-claims as to whether Iran's ballistic missile test on Sunday violated a U.N. Security Council resolution and the 2015 nuclear deal between Iran and six world powers, including the U.S.

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STEVE INSKEEP, HOST:

After more than two weeks, a manhunt in Turkey is over. Overnight, police captured the main suspect in a deadly attack at an Istanbul nightclub. The suspect is described as a native of Uzbekistan and a supporter of ISIS.

Iran's former president, Ayatollah Ali Akbar Hashemi Rafsanjani, was buried Tuesday, and the large outpouring of grief at his funeral reflects the uncertainty facing Iranian moderates.

Rafsanjani may have risen along with the country's 1979 Islamic revolution that toppled the U.S.-backed shah, but in later years, his pragmatic streak and respected position made him a leading voice of moderation.

A week after a gunman killed 39 people in an Istanbul nightclub, the suspected assailant remains at large and secular Turks are feeling under attack. ISIS claimed the shooting, calling it an assault on what it called "a pagan holiday." The government's pledge to defend all lifestyles hasn't kept an atmosphere of fear from descending on some of Istanbul's secular neighborhoods.

Turkey has announced eight detentions in connection with Sunday's shootings at an Istanbul nightclub. The Islamic State claimed responsibility for the attack that left 39 dead and 69 wounded. An intensive police search is under way for the gunman, who was not among those picked up Monday.

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