Democratic Sen. Richard Blumenthal said he is "dissatisfied and angry" after a classified briefing Tuesday.
Watch Blumenthal's remarks in the video player above.
"I am left with more questions than answers, especially about the cost of the war," Blumenthal told reporters after the briefing before the Senate Armed Services Committee.
The potential deployment of American ground troops to achieve Trump administration objectives is Blumenthal's biggest concern. He's also worried about Russia and China assisting Iran.
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"The American people deserve to know much more than this administration has told them about the cost of the war, the danger to our sons and daughters in uniform, and the potential for further escalation," Blumenthal said.