The former Navy SEAL trotted through downtown Washington DC to his new job atop a 17-year-old racehorse called Tonto.

Dressed in blue jeans, a modest top and a dark cowboy hat, Zinke looked as far removed from a typical Capitol Hill pedigree as you can get – though he did at least sport a white collar.

The Republican representative from Montana has taken the reins at a key post that oversees key oil and gas functions and national parks.

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