WASHINGTON(TIP): Defense Secretary James Mattis will resign at the end of February, he informed President Trump in a letter Thursday, December20. The defense secretary said he is stepping down because of the differences in viewpoints with Mr. Trump.

News of Mattis’ impending departure comes the day after Mr. Trump’s sudden announcement about Syria, a decision he made without consulting security officials in his administration.

“Because you have the right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position,” Mattis wrote.

Mr. Trump announced the news in a tweet and praised Mattis’ tenure as secretary.

“During Jim’s tenure, tremendous progress has been made, especially with respect to the purchase of new fighting equipment,” Mr. Trump wrote on Twitter. “General Mattis was a great help to me in getting allies and other countries to pay their share of military obligations. A new Secretary of Defense will be named shortly. I greatly thank Jim for his service!”

A senior White House official said that Mattis came to the White House for a meeting, not previously scheduled, around 3:30 p.m. Thursday, and informed the president he would be leaving. The president hopes to announce a replacement by the end of the year.

Text of Defense Secretary’s resignation letter.

“Dear Mr. President:

I have been privileged to serve as our country’s 26th Secretary of Defense which has allowed me to serve alongside our men and women of the Department in defense of our citizens and our ideals.

I am proud of the progress that has been made over the past two years on some of the key goals articulated in our National Defense Strategy: putting the Department on a more sound budgetary footing, improving readiness and lethality in our forces, and reforming the Department’s business practices for greater performance. Our troops continue to provide the capabilities needed to prevail in conflict and sustain strong U.S. global influence.

One core belief I have always held is that our strength as a nation is inextricably linked to the strength of our unique and comprehensive system of alliances and partnerships. While the US remains the indispensable nation in the free world, we cannot protect our interests or serve that role effectively without maintaining strong alliances and showing respect to those allies. Like you, I have said from the beginning that the armed forces of the United States should not be the policeman of the world. Instead, we must use all tools of American power to provide for the common defense, including providing effective leadership to our alliances. NATO’s 29 democracies demonstrated that strength in their commitment to fighting alongside us following the 9-11 attack on America. The Defeat-ISIS coalition of 74 nations is further proof.

Similarly, I believe we must be resolute and unambiguous in our approach to those countries whose strategic interests are increasingly in tension with ours. It is clear that China and Russia, for example, want to shape a world consistent with their authoritarian model – gaining veto authority over other nations’ economic, diplomatic, and security decisions – to promote their own interests at the expense of their neighbors, America and our allies. That is why we must use all the tools of American power to provide for the common defense.

My views on treating allies with respect and also being clear-eyed about both malign actors and strategic competitors are strongly held and informed by over four decades of immersion in these issues. We must do everything possible to advance an international order that is most conducive to our security, prosperity and values, and we are strengthened in this effort by the solidarity of our alliances.

Because you have the right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position. The end date for my tenure is February 28, 2019, a date that should allow sufficient time for a successor to be nominated and confirmed as well as to make sure the Department’s interests are properly articulated and protected at upcoming events to include Congressional posture hearings and the NATO Defense Ministerial meeting in February. Further, that a full transition to a new Secretary of Defense occurs well in advance of the transition of Chairman of the Joint Chiefs of Staff in September in order to ensure stability Within the Department.

 I pledge my full effort to a smooth transition that ensures the needs and interests of the 2.15 million Service Members and 732,079 DoD civilians receive undistracted attention of the Department at all times so that they can fulfill their critical, round-the-clock mission to protect the American people.

I very much appreciate this opportunity to serve the nation and our men and women in uniform.”

Both Republican and Democratic lawmakers expressed regret that Mattis was leaving the administration. House Democratic Leader Nancy Pelosi said she was “shaken” by Mattis’ resignation and expressed admiration for the letter he wrote to the president. “I think that everybody in the country should read his letter of resignation,” she told reporters. “It’s a letter of great patriotism, respect for the President, but also a statement of his values.”