Sen. Lindsey Graham (R-S.C.) on Thursday said he would consider granting the U.S. military a waiver to coordinate with Russian forces in Syria, adding that he’d “have to think long and hard” about such a move.

“That will be an interesting exercise,” Graham told reporters. “I want to give our commanders what they need to deal with the battle space and keep our troops safe. I’ll have to think long and hard about that one.”

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Current U.S. law prohibits coordination and collaboration with the Russian military, as stipulated in the National Defense Authorization Act following Russia’s 2014 annexation of Ukraine’s Crimea Peninsula.

U.S. Central Command head Gen. Joseph Votel earlier Thursday told reporters that any U.S. military coordination with the Russian military in Syria would require congressional approval or a waiver.

Votel’s remarks come after President Trump and Russian President Vladimir Putin met in Helsinki earlier this week and made “important verbal agreements” on increased cooperation between Washington and Moscow on international security matters, according to the Russian ambassador to the U.S.

Votel added that the military had “received no further direction than we’ve currently been operating under” in Syria, where the United States and Russia have backed opposing sides in the county’s more than seven-year civil war.

Graham said he would consider a waiver “if the generals convinced me it was militarily necessary and it didn’t empower Russia and Syria.”

Votel said he has not asked for such a waiver and is awaiting direction from the White House.

Sen. Tim Kaine (D-Va.), however, said until the administration briefs Congress on the Helsinki summit and “what the hell [Trump and Putin] talked about, we ain’t agreeing to anything.”

Secretary of State Mike Pompeo will testify before the Senate Foreign Relations Committee next week, where he's expected to face a grilling over the Trump-Putin summit.