ANKARA, Turkey — Turkish Prime Minister Binali Yildirim on Tuesday criticized U.S. presidential candidate Hillary Clinton for comments suggesting that she would consider providing arms to support Kurdish fighters in Syria.

For the United States, the Syrian Kurdish militia is the most effective force against the Islamic State group in Syria, but Turkey considers the force a terror organization because of its affiliation to Turkey's outlawed Kurdish rebels. Turkey strongly objects to U.S. moves to supply the group with weapons saying they often end up in the hands of the Kurdistan Workers' Party, or PKK, which has been fighting an insurgency since 1984.

The issue has strained relations between the two NATO allies.

Clinton said during Sunday's debate with Donald Trump that she favored continuing the Obama administration's policy of funneling weapons to Iraq's Kurdish armed forces and also hinted that she would consider extending that support to Syrian Kurdish fighters. Trump had nothing to say regarding the Kurds during the debate, but in July he called himself "a big fan of the Kurds."

Clinton's comments prompted an angry response from Yildirim, who questioned the "morality" of "fighting a terrorist organization with another terrorist organization."

Turkish Prime Minister Binali Yildirim speaks in Istanbul on Oct. 9, 2016.

Photo Credit: Hakan Goktepe/Pool photo via AP

"Isn't America our ally? Isn't it our NATO ally? Isn't it our ally in the region? What does it mean to support weapons with weapons?" Yildirim asked.

He added: "Where in the world have you ever seen this? How moral is it, how ethical is it, how right is it to fight a terrorist organization with another terrorist organization, to defeat a terrorist organization with another terrorist organization?"

In the debate, Clinton said: "I would consider arming the Kurds. The Kurds have been our best partners in Syria, as well as Iraq. And I know there's a lot of concern about that in some circles, but they should have the equipment they need so that Kurdish and Arab fighters on the ground are the principal way we take Raqqa after pushing ISIS out of Iraq."

Republican presidential nominee Donald Trump listens to Democratic presidential nominee Hillary Clinton during the second presidential debate at Washington University, Sunday, Oct. 9, 2016, in St. Louis.

Photo Credit: John Locher/AP

The Turkish government is also frustrated by what it regards as U.S. reluctance to arrest and extradite U.S.-based Muslim cleric Fethullah Gulen, accused by Turkey of being behind the failed military coup in July.

Gulen has denied any involvement in the attempted overthrow, while U.S. officials are urging Turkey to allow the legal process against Gulen to take its course.

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