WH official tells me Zinke's exit necessary. Why? Grijalva (D-Ariz.) will soon take gavel at Natural Res. Cmmte.

Since Zinke has taken personal shots at Grijalva for his struggles w/ alcoholism, official says the WH, already embattled, wants to avoid brutal/newsy Zinke hearings.

— Robert Costa (@costareports) December 15, 2018