FILE PHOTO: U.S. President Donald Trump speaks during a roundtable on immigration and the gang MS-13 at the Morrelly Homeland Security Center in Bethpage, New York, U.S., May 23, 2018. REUTERS/Kevin Lamarque

WASHINGTON (Reuters) - President Donald Trump, speaking on Thursday after canceling a summit with North Korean leader Kim Jong Un, said the U.S. military stood ready if Kim were to take any “foolish” action.

American forces are “ready if necessary,” Trump said at a White House bill signing event.