I don't believe North Korea has the capabilites to launch a TBM at the U.S.A., but rather only at its neighboring Countries. U.S., Russia, Great Britain, France, and Japan (Not sure, maybe China) are the only nations in the world with that capability. Other nations have Nuclear threats, but not very effective means to carry out those threats.
North Korea cannot launch a nuke from there to here, no. China and Russia are the only ones capable who have a remote chance of doing it.