"It's no secret that there are some trends within Turkey that I have been troubled with," Obama said yesterday, when asked whether he considers the Turkish leader an authoritarian.
"I think the approach they have been taking toward the press is one that could lead Turkey down a path that would be very troubling."
Obama said he had expressed these sentiments to Erdogan "directly."
The pair met at the White House on Thursday for talks away from the cameras.
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Ahead of the trip, the White House had suggested Obama would not formally meet him, prompting suggestions of a snub.
The possibility of no meeting had been glaring -- the two countries are meant to be close NATO allies in the thick of a fight against the Islamic State group in Syria.
But tensions have been stirred by Ankara's attacks on Kurdish militants, some of whom are seen by Washington as the best bet for tackling IS fighters in Iraq and northern Syria.
Turkish forays into northern Iraq have also strained ties.