Turkey's presidential spokesman Ibrahim Kalin said Trump should respect Washington's alliance with Ankara.
"Mr @realDonaldTrump It is a fatal mistake to equate Syrian Kurds with the PKK, which is on the US terrorists list, and its Syria branch PYD/YPG," spokesman Ibrahim Kalin wrote on Twitter.
"Terrorists can't be your partners & allies. Turkey expects the US to honor our strategic partnership and doesn't want it to be shadowed by terrorist propaganda," he said on Monday.
Trump gave no details about the safe zone proposal. He announced last month he would withdraw U.S. forces from Syria, declaring they had succeeded in their mission to defeat the Islamic State group and were no longer needed.