tonight, experts warn the test of a short range missile, like the one kim just launched, while seemingly less menacing than other weapons, allows the regime to tweak technology and allows an intercontinental ballistic missile which could some day carry a nuclear warhead to the u.s. mainland. u.s. officials concerned about north korea's development after new arsenal of missiles which use solid fuel rather than liquid fuel. >> the solider capable fired much more quickly. don't necessarily have to be fuelled or have sort of support apparatus. there is no launch pad. or anything like that. so they can be put on trucks, made mobile, and therefore fired in principle from anywhere. >> this puts more pressure on the u.s. to upgrade its ability to shoot down north korean missiles. pentagon preparing for an interceptor test on tuesday. president trump today tweeting about the north korean threat, quote, north korea has shown