U.S. President Donald Trump on Monday ruled out agreeing to any demands from Turkey to gain the release of a detained American pastor and said he was not concerned that his tough stance could end up hurting European and emerging market economies.

In a wide-ranging Oval Office interview with Reuters, Trump complained about interest rate hikes by the Federal Reserve and suggested he was having second thoughts about Jerome Powell, his choice for Fed chair. He also said he “most likely” will have a second meeting with North Korean leader Kim Jong Un and indicated he would consider lifting U.S. sanctions on Russia if Moscow took some actions in return.

Trump said he thought he had a deal with Turkish President Tayyip Erdogan when he helped persuade Israel to free a detained Turkish citizen. He had thought Erdogan would then release pastor Andrew Brunson, who denies Turkey’s allegations that he was involved in a plot against Erdogan two years ago. “I think it’s very sad what Turkey is doing. I think they’re making a terrible mistake. There will be no concessions,” he said, as reported by Reuters.

Turkey has demanded that the United States hand over Fethullah Gulen, a Turkish cleric in the United States suspected in the coup plot against Erdogan, but the United States has balked at this.

Trump has imposed tariffs on imports of Turkish steel and aluminum in response to Erdogan’s refusal to free Brunson, raising concerns of economic damage in Europe and in emerging market economies. “I’m not concerned at all. I’m not concerned. This is the proper thing to do,” he said, when asked about the potential damage to other economies.