Senate Democrats are moving ahead with efforts to rein in President Donald Trump’s authority to launch military action against Iran, seeking to build momentum behind a war powers resolution that could come to a vote this week, despite an increasingly fragile ceasefire.

Sen. Tim Kaine (D-VA) is leading an effort to restrict Trump’s ability to launch military action against Iran without congressional approval. Kaine, Sens. Adam Schiff (D-CA), and Andy Kim (D-NJ) unveiled new language to clarify that the restriction would apply only to offensive military operations.