WASHINGTON (AP) — President Donald Trump declared on Thursday the United States will impose sanctions on Turkey, a crucial NATO ally, in retaliation for the detention of an American pastor on terror and espionage charges.

Turkey's response was both harsh and dismissive, calling his words "unacceptable" and a "cheap threat."

Trump's promise of punishing action marks the latest deterioration in relations between Turkey and the U.S. as President Recep Tayyip Erdogan's powers expand two years after a failed coup against his government.

Trump also has praised his counterpart, saying Erdogan's leade...