"Little detail is currently available about the Trump Administration's agenda for missile defense and whether current policy or program direction might change. The Administration has thus far said only that it will 'develop a state-of-the-art missile defense system to protect against missile-based system attacks from states like Iran and North Korea.' A detailed defense budget will not be presented until later this spring, so there is uncertainty as to what precisely the BMD [ballistic missile defense] budget and program will look like. Ongoing BMD issues of interest to Congress are summarized [in this report]."
CRS Insight, IN10655
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html