A bipartisan measure limiting President Donald Trump’s authority to launch military operations against Iran is moving toward approval in the Senate.

Axar.az reports citing foreign media that the resolution, authored by Democratic Sen. Tim Kaine of Virginia, asserts that Trump must win approval from Congress before engaging in further military action against Iran. Eight Republicans sided with Democrats Wednesday on a procedural motion to force a vote on the issue as soon as Thursday.

Trump disputed that, arguing in two tweets Wednesday that a vote against Kaine’s proposal was important to national security and pointed to the Jan. 3 drone strike that killed Iran’s top general, Qassem Soleimani.