Democrats demanded an immediate briefing and even Republicans conceded they had no information on an agreement the administration has declined to release.
Lawmakers, including some of President Trump’s closest allies, slammed the emerging agreement as effectively undermining the president’s own war goals.
With four Republican backers, Democrats won a vote to advance a resolution that would force the president to end hostilities or win authorization from Congress.
The president’s top military adviser is walking a tightrope as he leads the military through a divisive and unpopular war.
A decades-old law allows the president to wage war without congressional approval for 60 days, then limits his options for continuing. President Trump may seek to get around it.
The Treasury secretary said that currency swap line would benefit both the United Arab Emirates and the United States.
In a letter, the 11 senators questioned the defense secretary’s decision to gut programs intended to protect civilians and said his orders endangered U.S. troops.
The G.O.P. narrowly blocked a Democratic war powers resolution, but a senior Republican suggested that backing for the conflict is not open-ended and could wane as a statutory deadline approaches in weeks.
Concerns over the Iran war led several Democratic senators who had rejected past bids to curb weapons transfers to Israel to vote to block the sale of bulldozers and bombs.
For the fourth time since the war began, G.O.P. senators successfully fended off an effort to constrain the president. But there were signs of growing unease among Republicans.