US Defense Secretary, James Mattis announced on Thursday that he would resign at the end of February, sending a letter to President Trump saying he deserved a secretary "whose views are better aligned with yours."
The announcement came a day after the White House said the U.S. would be withdrawing its troops from Syria, as well as reports it was also considering a drawdown in Afghanistan. Both moves have been met with opposition by Pentagon officials and members of the foreign policy establishment.
In a striking resignation letter to Trump, Mattis signaled his concern with the way Trump treated allies in NATO as well as rivals such as China and Russia.