ANKARA, Turkey (AP) — A senior U.S. official trying to negotiate the safety of Kurdish allies in northeastern Syria was apparently rebuffed by Turkey’s president who said Tuesday there would be “no concession” in Ankara’s push against terror groups in the war-torn country.

White House national security adviser John Bolton met for roughly two hours with his Turkish counterpart Ibrahim Kalin and other senior officials at Ankara’s presidency complex but got no assurances on the safety Syrian Kurdish allies — a condition for President Donald Trump’s planned withdrawal of U.S. troops from northeastern Syria.

Bolton relayed Trump’s insistence that Turkey refrain from attacking Kurdish forces that fought alongside U.S. troops against the Islamic State group, a guarantee Turkey appeared unwilling to grant.

“They had a productive discussion of the President’s decision to withdraw at a proper pace from Northeast Syria,” spokesman Garrett Marquis said in a statement, adding that direct military to military talks would continue Tuesday.

Shortly after Bolton’s meetings and in an apparent snub to the U.S. diplomatic push, Turkish President Recep Tayyip Erdogan said Ankara’s preparations for a new military offensive against terror groups in Syria are “to a large extent” complete.

“We cannot make any concessions,” Erdogan said, and also slammed Bolton over comments suggesting the United States would prevent attacks on Kurds.

Turkey insists its military actions are aimed at Kurdish fighters in Syria — the Syrian Kurdish Peoples Protection Units, or YPG — whom it regards as terrorists, and not against the Kurdish people. That has been Ankara longtime position and Turkey rejected any role for Kurdish fighters in restoring peace to the war-torn region.

Bolton is to depart Turkey without meeting with Erdogan, which U.S. officials said Saturday was expected. Marquis said U.S. officials were told Erdogan cited the local election season and a speech to parliament for not meeting with Bolton.

Trump’s shifting timetable for pulling U.S. troops out of Syria has left allies and other players in the region confused and jockeying for influence over a withdrawal strategy that appeared to be a work in progress.

After Bolton announced this week the U.S. pullout would not be as immediate as Trump had initially declared, U.S. allies were still seeking clarification from American diplomats. The Kurds, who have fought alongside U.S. forces against IS and fear an assault by Turkey if the U.S. withdraws, publicly said they awaited explanation from Washington.

Bolton said the U.S. would seek assurances from Turkey before withdrawing that it would not harm the Kurds — for the first time adding a “condition” to the withdrawal.

However, Erdogan’s remarks Tuesday to his ruling party lawmakers in parliament underscored the destabilizing impact of Trump’s spur-of-the-moment withdrawal announcement, with no details, leaving allies scrambling for answers and aides crafting a strategy that can satisfy all the players, including Trump.

Trump discussed Syria during a phone call Monday with French President Emmanuel Macron, who had warned Trump’s decision could have dangerous consequences. White House press secretary Sarah Sanders said they discussed the commitment of their two countries “to the destruction of ISIS as well as plans for a strong, deliberate, and coordinated withdrawal of U.S. troops from Syria.”

“We don’t think the Turks ought to undertake military action that’s not fully coordinated with and agreed to by the United States,” Bolton said Sunday, adding that Trump has made clear he would not allow Turkey to kill Kurds.

Bolton had said the protection of U.S. allies in Syria, including the YPG, was among “the objectives that we want to accomplish that condition the withdrawal” of U.S. forces.

Speaking to The Associated Press from northern Syria on Monday, a Syrian Kurdish official said the Kurds have not been informed of any change in the U.S. position and were in the dark about Bolton’s latest comments.

“We have not been formally or directly notified, all what we heard were media statements,” Badran Ciya Kurd said.

Kurdish officials have held conversations with Moscow and Syrian President Bashar Assad’s government about protection, but Bolton called on them to “stand fast now.”

Bolton’s pronouncements were the first public confirmation from the administration that the pace of the drawdown had changed since Trump’s announcement in mid-December that U.S. troops are “coming back now.” Trump faced widespread criticism from allies about his decision, including that he was abandoning the Kurds in the face of Turkish threats. Officials said at the time that although many details of the withdrawal had not yet been finalized, they expected American forces to be out by mid-January.

At the time, Trump had also said that Turkey would step up the fight against the remnants of the Islamic State in Syria, but Bolton said Sunday U.S. troops will eliminate what remains of IS as another “condition” to northeastern Syria.

Trump on Monday struck back at the perception that his intentions in Syria had changed. “No different from my original statements, we will be leaving at a proper pace while at the same time continuing to fight ISIS and doing all else that is prudent and necessary!…..” he said in a tweet.

While Sanders said last month the administration had “started returning United States troops home,” the Pentagon said Monday no U.S. troops have withdrawn from Syria yet, but added that there is an “approved framework” for withdrawal.

Bolton maintained there is no fixed timetable for completing the drawdown, but insisted it was not an indefinite commitment to the region. Still, some 200 U.S. troops will remain in the vicinity of al-Tanf, in southern Syria, to counter growing Iranian activity in the region, he said.

In meetings with Turkish officials Tuesday, Bolton was joined by the chairman of the U.S. Joint Chiefs of Staff Gen. Joseph Dunford, who will remain in Turkey for additional meetings with Turkish military officials, as well as Jim Jeffrey, the special representative for Syrian engagement and the newly named American special envoy for the anti-Islamic State coalition. Jeffrey will travel from Turkey into Syria to reassure the Kurdish fighters that they are not being abandoned, Bolton said.

Secretary of State Mike Pompeo left Washington on Monday for an eight-nation trip of the Middle East. Both he and Bolton are seeking input and support for the specifics of the withdrawal plan, according to one official, who said U.S. partners were eager for details.

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By ZEKE MILLER, Associated Press

Associated Press writers Suzan Fraser in Ankara, Turkey, Bassem Mroue in Beirut, and Robert Burns and Matthew Lee in Washington contributed to this report.