Senate Majority Whip Dick DurbinRichard (Dick) Joseph DurbinSenate Democrats push Trump to permanently shutter migrant detention facility House panel investigating decision to resume federal executions To combat domestic terrorism, Congress must equip law enforcement to fight rise in white supremacist attacks MORE (D-Ill.) on Wednesday requested Defense Secretary Chuck HagelCharles (Chuck) Timothy HagelOvernight Defense: US, Russia tensions grow over nuclear arms | Highlights from Esper's Asia trip | Trump strikes neutral tone on Hong Kong protests | General orders ethics review of special forces Five takeaways from Pentagon chief's first major trip Esper given horse in Mongolia as US looks for new inroads against China MORE to investigate mismanagement at military hospitals.

In a letter to Hagel, Durbin asked the Pentagon chief to evaluate the military health care system in light of a recent article in The New York Times finding that smaller hospitals have higher rates of complications or deaths than civilian hospitals. 

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Durbin, who chairs the Senate Appropriations subcommittee on defense, asked Hagel to brief his panel on its conclusions as part of an already ongoing review of the military health system ordered in May. The assessment is expected to be completed in the fall.

"In light of deeply concerning reports of subpar care and mismanagement within the military health system, I ask that all cases of permanent harm or death are thoroughly and impartially investigated," Durbin wrote. "I request that you ensure these concerns are addressed in this review and to brief the Committee on its results and conclusions as soon as possible."