On January 25, Trump issued an executive order directing to the Department of Homeland Security and the Justice Department to block federal funding to “sanctuary jurisdictions.” Sanctuary jurisdictions are loosely defined as states and cities that do not cooperate with federal immigration enforcement, but DHS has not issued a legal definition.
On January 28, Trump issued a presidential memorandum on the makeup of the National Security Council. The memo removed the Chairman of the Joint Chiefs of Staff and the Director of National Intelligence from the Principals Committee and named presidential strategist Steve Bannon as a member of the Principals Committee.
On January 30, Trump fired Acting Attorney General Sally Yates after she refused to enforce Trump’s executive order (January 27) on immigration and refugees.
On January 31, Trump nominated Neil Gorsuch to fill the vacancy on the Supreme Court following the death of Justice Scalia in February 2016. President Obama had nominated Judge Merrick Garland for the position in March 2016, but the Republicans refused to hold a hearing on the nomination.