Democratic lawmakers escalated their oversight of the Trump administration's military posture in the Middle East on Thursday, announcing a fresh investigation into the Pentagon's handling of an Iranian drone strike that killed six American service members in Kuwait earlier this year.

In a letter sent Wednesday to Defense Secretary Pete Hegseth, a group of Senate and House Democrats demanded detailed answers about the March 1 attack on a U.S. military facility at Port Shuaiba. The strike, which also injured several troops, has become a flashpoint for criticism of the administration's strategy as U.S. strikes on Iran continue.

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The lawmakers noted that the Pentagon has not provided the results of the Army's internal investigation into the incident, nor responded to an earlier April inquiry from several of the same members. "Since we sent those letters, at least five more service members have been killed and additional reporting sheds further light on the Trump administration's ineptitude and lack of preparedness in launching its war against Iran," they wrote.

The investigation is being led by Sen. Elizabeth Warren (D-Mass.) and Rep. Pat Ryan (D-N.Y.), with nearly a dozen other Democrats from both chambers signing on. The group cited media reports indicating that injured service members did not receive timely medical care after the attack, raising concerns about broader failures in force protection.

"We request further information on why soldiers injured in the attack appear to have not gotten timely access to medical care and on the Trump administration's apparent inadequate preparation for attacks against service members in region, including at Port Shuaiba," the letter stated.

The lawmakers pointed to gaps in U.S. defenses against drone threats, a vulnerability that has been exposed repeatedly during the conflict. "We are already seeing the tragic consequences of Iranian strikes evading U.S. defenses, and we are concerned by reports that military infrastructure in the region is unable to protect service members from these attacks," they wrote.

The Pentagon, in a statement to The Hill, said it would respond directly to the lawmakers. The Democrats have set an August 12 deadline for a response, framing the issue as a test of the administration's accountability. "As you and President Trump continue to risk the lives of service members in this reckless war, the American people deserve answers on whether you were adequately prepared to protect service members from Iranian attacks and get them the care they needed," the letter concluded.

The investigation comes amid broader scrutiny of the administration's Iran policy, including questions about retaliatory strikes and their effectiveness in deterring further attacks. The Port Shuaiba incident has become a symbol of the human cost of the conflict, with Democrats pressing for transparency as the death toll rises.