Comerica says it shares Sen. Elizabeth Warren’s concerns about fraud in the federal program through which the bank provides prepaid cards and electronic benefit payments to veterans and disabled Americans but argues the system is still much safer than the paper checks it replaced.

Warren, a Massachusetts Democrat who began investing the Direct Express program after a constituent complained that Dallas-based Comerica failed to protect a relative’s account and didn’t reimburse the stolen benefits quickly enough, tallied recent fraud complaints and assessed how they were handled in a letter this week to Treasury Secretary Steve Mnuchin.