The Senate will vote on the United States’s involvement in Israeli operations against Iran after a new Democratic-led resolution attempting to bar President Donald Trump from joining the conflict without Congress’s approval was introduced.

Sen. Tim Kaine (D-VA) introduced a resolution Monday that requires congressional debate and a vote before the U.S. takes any offensive measures against Iran. Trump has so far provided defensive support to Israel, which launched military strikes against Iranian nuclear sites on Thursday. However, Trump said Sunday that the U.S. could get more “involved.”

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In a statement, Kaine said, “It is not in our national security interest to get into a war with Iran unless that war is absolutely necessary to defend the United States. I am deeply concerned that the recent escalation of hostilities between Israel and Iran could quickly pull the United States into another endless conflict.”

Kaine’s resolution came as Democrats have called for de-escalation in the conflict, with congressional leaders, including House Minority Leader Hakeem Jeffries (D-NY), urging Trump to “avoid any situation where U.S. troops are put in harm’s way.”

Republicans have broadly supported Israel’s actions, saying they are necessary to prevent Iran from building a nuclear bomb. However, the more isolationist wing of the party, including prominent figures on the MAGA Right, has joined Democratic calls for the U.S. to stay out of the fight.

Trump has resisted pressure to strike Fordow, an underground enrichment facility, and has reportedly vetoed Israeli requests to target Iran’s leader directly.

Kaine’s resolution is privileged under the War Powers Act, meaning Republicans must bring it to the floor for a vote, though there is some flexibility on the timing. It’s possible the resolution won’t be brought forward until after the July 4 recess, since such resolutions take 10 days to “ripen.”

A senior member of the Foreign Relations Committee, Kaine has used privileged resolutions liberally in the new Congress, forcing repeated votes on Trump’s tariffs and deportation of migrants to El Salvador.

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He also moved to limit Trump’s military powers in 2020 after the killing of a top Iranian general in a drone strike. Eight Republicans ultimately joined Democrats in supporting the measure.

Kaine’s current resolution allows the U.S. to defend itself from Iranian attacks in the region, as its proxies have previously attacked U.S. military bases.