U.S. Senate Democrats made clear on Wednesday they have serious concerns about President Barack Obama’s war authorization request for his Islamic State campaign, although they hoped lawmakers could pass a compromise measure.

The politically charged initiative would give specific authority and limitations to the seven-month-long campaign, which is being fought under broad approvals passed more than a decade ago for foreign military endeavors under President George W. Bush.

Despite appeals from top administration officials for bipartisan support, Republican Senator Bob Corker, chairman of the Foreign Relations Committee, told a committee hearing that no Democrats backed the proposal.

More: Senate Democrats Oppose ‘Blank Check’ for Islamic State Fight