and they do nothing. join us and tell your member of congress that they have a moral responsibility to stop doing what's political and start doing what's right. our country depends on it. tonight north korea's complaining that the presence of three u.s. aircraft carriers off the korean peninsula is pushing the region closer to a nuclear war. this comes at the same time there's breaking news here in washington as senators question whether president trump is stable enough to have command of the u.s. nuclear arsenal. cnn's brian tom is working this story for us. tell us. >> very stark and sobering observations from this hearing, wolf. even from a nato ally about