Probably just tired of it. Remember that interior, just like EPA head, is a position where you’re not just fighting the media and the democrats but the government-lifer staff on the payroll who is SUPPOSED to be your employees and direct reports are actively trying to do anything that they can to personally destroy you, too.
In particular the National Park Service falls under the DOI that would fit your description.
In the bygone era, the park ranger was a people friendly dude that rode a horse and was there to see that people enjoyed the park. Today a park is a haven to save animals with rangers converted to federal police and are more interested in saving the animals and harassing visitors.
And they are very politically active in the community. Case in point would be the park in ND where the superintendent personally attended community meetings to protest oil development in general and in particular oil wells within eyesight of the park.
This same park had an elk size that could not be supported by the park size and kept getting bigger and bigger. Culling the herd was unquestionable until ND Senator forced the issue by having legislation enacted to authorize the hunting of elk within that park.
And needless to say, oil development went on.