President Donald Trump speaks about American missile defense doctrine, Thursday, Jan 17, 2019, at the Pentagon. (AP Photo/ Evan Vucci)
This Dec. 10, 2018, file photo, provided by the U.S. Missile Defense Agency (MDA),shows the launch of the U.S. military’s land-based Aegis missile defense testing system, that later intercepted an intermediate range ballistic missile, from the Pacific Missile Range Facility on the island of Kauai in Hawaii. The Trump administration will roll out a new strategy Thursday, Jan. 17, 2019, for a more aggressive space-based missile defense system to protect against existing threats from North Korea and Iran and counter advanced weapon systems being developed by Russia and China. (Mark Wright/Missile Defense Agency via AP)
WASHINGTON — Declaring that space is the new warfighting domain, President Donald Trump on Thursday vowed the U.S. will develop an unrivaled missile defense system to protect against advanced hypersonic and cruise missile threats from competitors and adversaries.