Article snippet: WASHINGTON — President Trump on Monday cast his decision to abandon Kurdish fighters in Syria as fulfilling a campaign promise to withdraw from ‘‘endless war’’ in the Middle East, even as Republican critics and others said he was sacrificing a US ally and undermining American credibility. Trump declared US troops would step aside for an expected Turkish attack on the Kurds, who have fought alongside Americans for years, but he then threatened to destroy the Turks’ economy if they went too far. Even Trump’s staunchest Republican congressional allies expressed outrage at the prospect of abandoning Syrian Kurds who had fought the Islamic State group with American arms and advice. It was the latest example of Trump’s approach to foreign policy that critics condemn as impulsive, that he sometimes reverses and that frequently is untethered to the advice of his national security aides. ‘‘A catastrophic mistake,’’ said Rep. Liz Cheney of Wyoming, the No. 3 House Republican leader. ‘‘Shot in the arm to the bad guys,’’ said Sen. Lindsey Graham of South Carolina. Trump said he understood criticism from fellow GOP leaders but disagreed. He said he could also name supporters, but he didn’t. Pentagon and State Department officials held out the possibility of persuading Turkey to abandon its expected invasion. US officials said they had seen no indication that Turkey had begun a military operation by late Monday. Trump, in late afternoon remarks to reporters, appeared largely ... Link to the full article to read more