He is the latest in a series of high-profile departures from the president’s administration.

Mr Trump posted on Twitter: “Secretary of the Interior @RyanZinke will be leaving the Administration at the end of the year after having served for a period of almost two years,” adding that a replacement would be announced next week.

Mr Zinke is facing an investigation into his travel, political activity and possible conflicts of interest.

Mr Zinke played a leading part in President Trump’s efforts to roll back environmental regulations and promote domestic energy development.

The president did not give a reason for Mr Zinke’s departure but the former Navy Seal and ex-congressman from Montana has come under scrutiny for his use of security details, chartered flights and a real estate deal.

Mr Trump said on Twitter: “Ryan has accomplished much during his tenure and I want to thank him for his service to our Nation.”

His departure comes amid a shake-up of key staff as President Trump heads into his third year in office.

A batch of other top officials have left the White House, including a secretary of state, two national security advisers, an attorney general and the head of the US environment agency.

The president on Friday named budget director Mick Mulvaney as chief of staff.

Mr Zinke is one of a number of members of Mr Trump’s cabinet to come under scrutiny over expenditures, including reports that his department was spending nearly $139,000 to upgrade three sets of double doors in his office.

He has also came under fire for expensive US Park Police helicopter flights last year that allowed him to return to Washington for a horseback ride with Vice President Mike Pence, and several other flights on non-commercial aircraft.

On a visit to assess the damage from California’s wildfires, Mr Zinke echoed President Trump’s claims that lax forest management was to blame in the devastation.

He pushed to develop oil, natural gas and coal beneath public lands in line with the administration’s business-friendly aims.

But Mr Zinke has been beleaguered by ethics probes, including one centred on a Montana land deal involving a foundation he created and the chairman of an energy services company that does business with the Interior Department.

Mr Zinke’s decision to block two tribes from opening a casino in Connecticut and his redrawing of boundaries to shrink a Utah national monument is also being investigated. He has denied any wrongdoing.

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