Even so, Mr. Trump limited his criticism of Turkey, making no mention of taking punitive action, while Republicans on Capitol Hill were sharply critical of Turkey’s president, Recep Tayyip Erdogan, for following through with a plan he disclosed to Mr. Trump in a phone call on Sunday. And Pentagon officials privately expressed their anger over Mr. Trump’s sudden and unplanned shift in what had been American policy for years to oppose Turkey’s longtime desire to seize territory across its border with Syria.
Senator Lindsey Graham of South Carolina, a close ally of Mr. Trump’s who often speaks and plays golf with the president, said in an interview that he had reached an agreement with Senator Chris Van Hollen, Democrat of Maryland, to offer “severe” sanctions legislation against Turkey, which Mr. Graham predicted would have “widespread bipartisan support.”
“What you’ll be seeing in the coming days is Congress filling in the vacuum,” Mr. Graham said, likening Mr. Trump’s posture to President Barack Obama’s deep-seated aversion to engagement in Syria. “Obama basically took a pass on Syria and the rest is history. We can’t afford to make that same mistake twice.”
In a joint statement, Mr. Graham and Mr. Van Hollen said their bill would punish senior Turkish government officials and ban American military transactions with Turkey. The measure would also impose sanctions on Turkey for its purchase of a sophisticated Russian-made missile defense system. Mr. Trump has avoided enforcing those sanctions, which members of Congress insist are mandatory under a 2017 law meant to penalize countries for doing business with Russia’s military.
“This invasion will ensure the resurgence of ISIS in Syria, embolden America’s enemies including Al Qaeda, Iran and Russia, and launch yet another endless conflict in what had been, until today, one of the most safe and stable areas of Syria and a region experimenting with the best model of local governance currently available in that war-torn country,” the senators said in their statement.