WASHINGTON — President Donald Trump says Interior Secretary Ryan Zinke (ZIN’-kee), who’s facing federal investigations into his travel, political activity and potential conflicts of interest, will leave the administration at year’s end.

Trump tweets that Zinke “accomplished much during his tenure” and that a replacement would be announced next week. The Cabinet post requires Senate confirmation.

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. Ryan has accomplished much during his tenure and I want to thank him for his service to our Nation…….

— Donald J. Trump (@realDonaldTrump) December 15, 2018

Zinke, a former Republican congressman from Montana, is leaving weeks before Democrats take control of the House, a shift in power that promised to intensify probes into his conduct.

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

His departure comes amid a staff shake-up as Trump heads into his third year in office. The president on Friday named budget director Mick Mulvaney as chief of staff.