Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) called Turkey's foreign minister on Wednesday at President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s behest amid ongoing tensions over Ankara’s decision to buy a Russian antimissile system, the senator said Thursday.

Graham said he delivered a message to Foreign Minister Mevlut Cavusoglu about a “win-win” situation for Turkey and the United States if Ankara reverses course on the Russian S-400.

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“The S-400, that problem can be solved, and the relationship can flourish,” Graham said he told the foreign minister. “This can be a win-win. If the S-400 is activated, then the relationship takes a very dark turn.”

Turkey’s acceptance of the Russian system prompted the United States to suspend that nation's participation in the F-35 fighter jet program and has several U.S. lawmakers calling for harsh sanctions against the NATO ally.

“My pitch to Turkey was: Let’s stand down on the S-400, let’s start free trade agreement negotiations, which would change the Turkish economy, would help the American economy, will give us a much closer economic relationship,” Graham said. “The S-400 is a $4 billion purchase. They’ve had to be removed from the F-35 program, that’s a $10 billion loss. If there was a free trade agreement negotiation that resulted in a product it would fundamentally change Turkey’s economy. What I’m asking for is cooler heads to prevail.”

The White House did not comment for this story.

Turkey began receiving parts for the S-400 earlier this month, followed days later by the Trump administration officially suspending Turkey from the F-35 program.

U.S. officials are concerned the S-400’s powerful radars could be used to gather information on the United States’s most advanced fighter jet.

The Countering America's Adversaries Through Sanctions Act also requires sanctions on those who do business with Russia’s defense industry, and lawmakers in both parties have been calling for Trump to impose the mandatory sanctions.

But Trump has yet to levy sanctions on Turkey, leaving some lawmakers worried he will waive them. Trump said last week he was still considering whether to impose sanctions.

A meeting at the White House on Tuesday with Republican senators reportedly saw Trump at odds with members over the issue, with Trump opposed to harsh sanctions.

In public, Trump has appeared sympathetic to Turkey’s position, placing the blame on the Obama administration for not selling Turkey the U.S.-made Patriot system.

The United States offered to sell Turkey the Patriot system in both the Obama and Trump administrations, but Ankara turned down the offers because the United States would not share sensitive technology Turkey wants to be able to build its own weapons.

Senate Foreign Relations Committee Chairman Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Idaho) said Wednesday that the White House meeting saw a “spirited discussion,” but denied he fought with Trump.

“That’s all a work in progress,” Risch said of sanctions. “Obviously, everybody’s discussing that because Turkey can’t have the S-400 and F-35, so how do you reconcile that?”

Sen. Marco Rubio Marco Antonio RubioGOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' Graham vows GOP will accept election results after Trump comments MORE (R-Fla.), who was not at the meeting Tuesday, told reporters Wednesday that his “understanding is that the president made it pretty clear he would not like to impose the sanctions.”

On Thursday, Graham said he doesn’t think sanctions need to be imposed until Turkey activates the S-400, which it has not done.

Still, he acknowledged he was taking a softer position than other Republican senators.

“Some of us are harder on Turkey than I am, quite frankly,” Graham said. “But I think there’s space to do a free trade agreement if you don’t activate the system. If the system gets activated, there are no options left.”

Updated at 6:33 p.m.