The Democrat also accused Trump of baiting North Korean leader Kim Jong Un into war.
The president's inexperience and volatility have forced the military's leaders to keep a low profile. That's bad for democracy.
Reserve units across the country were sent home Saturday from planned training.
U.S. must make a sustained financial investment in the military to overcome “a period of strategic atrophy,” document says.
The decision appears to bring to a close an embarrassing incident for the White House Communications Agency.
Deadly collisions involving Navy vessels are rare, and often are both embarrassing and politically charged afterward.
The collisions involving the USS Fitzgerald and USS John S. McCain together left 17 sailors dead.
B-52s, B-1Bs and B-2s are all currently based in Guam.
The U.S. military is a kaleidoscope of cultures, races and religions, with units pulling together to meet common goals under occasionally brutal circumstances.
Smaller nuclear warheads are necessary due to the "deterioration of the strategic environment," the document said.