House Republicans launch probe of Buttigieg response to Ohio train derailment | The Hill

In response, Buttigieg noted in a tweet that the National Transportation Safety Board, which is investigating the incident, is independent, not part of the Transportation Department. 

"I am alarmed to learn that the Chair of the House Oversight Committee thinks that the NTSB is part of our Department," he wrote…

https://thehill.com/policy/energy-environment/3873346-house-republicans-launch-probe-of-buttigieg-response-to-ohio-train-derailment/