WASHINGTON — Senator Claire McCaskill, responding to what she has called troubling weaknesses in protections for whistle-blowers, has asked federal agencies to provide information on senior managers who may have retaliated against employees who reported wrongdoing.

Her request was prompted by a statement in June from the Transportation Security Administration that said that despite a number of documented cases of such reprisals, neither the courts nor government agencies had confirmed whistle-blower retaliation by any senior manager at the agency.

Ms. McCaskill, Democrat of Missouri, asked the agency about any disciplinary actions against managers after The New York Times reported that T.S.A. employees had been reassigned, demoted, investigated or fired for reporting lapses or misconduct by senior leaders. She said that data from the Office of Special Counsel, an independent agency that protects federal employees from reprisal, showed that claims of retaliation by at least seven employees were substantiated.