About this he wrote on his Twitter page.

“General Mattis will retire with distinction at the end of February after two years of service in my administration as defense minister,” he said.

It was a lawn for the past two years. It has been made, especially for the purchase of new fighting ....

- Donald J. Trump (@realDonaldTrump) December 20, 2018

Trump added that the candidacy of the new head of the Pentagon will be called "soon."

The US president added that Mattis helped him a lot in his activities and, in particular, "was able to force the allies and other countries to pay their share of military obligations."

Earlier, Trump said that the head of the White House office, John Kelly, will retire at the end of the year.