Turkish President Tayyip Erdogan’s spokesman said on Thursday the U.S. administration will not achieve its desired results by threatening Turkey, after U.S. President Donald Trump warned of sanctions unless Ankara freed an American pastor.

“The United States must reconsider its approach and adopt a constructive position before inflicting further damage to its own interests and its alliance with Turkey,” Ibrahim Kalin said in a written statement.

Turkish Foreign Minister Mevlut Cavusoglu  also called U.S. Secretary of State Mike Pompeo to discuss the threat of sanctions, Turkish and State Department officials said, without elaborating.

U.S. President Donald Trump on Thursday threatened to slap “large sanctions” on Turkey unless it freed an American pastor, prompting an angry response from Ankara and further escalating tensions between the two NATO allies.