The Federal Emergency Management Agency (FEMA) headquarters in Washington, DC, on February 17. Stefani Reynolds/Bloomberg/Getty Images

The Trump administration has launched an internal investigation into FEMA employees who signed a public letter to Congress warning that the administration’s overhaul of the disaster relief agency is undermining emergency response and endangering the public.

As part of the probe, the agency has ordered the employees — who were placed on leave in August — to sign non-disclosure agreements and schedule interviews with investigators, according to five sources and internal emails reviewed by CNN.

At least seven FEMA staffers received emails Tuesday from investigators at the Office of Professional Responsibility, which included the non-disclosure forms, th

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