officials including mattis and secretary of state rex tillerson. the president himself may not show up. the white house says if he does come it will be a quote brief drop by. that has a lot of president's critics concerned that this meet cigarette nothing more than a giant photo op. republicans are push back. >> interesting new development this morning the u.s. military observing significant activity at a north korean nuclear testing site. new digging effort at a tunnel suggests another nuclear test is not imminent. paula hancock is tracking developments live from seoul. good morning, paula. >> reporter: hello. there's satellite imagery is the way we find out exactly what's happening, that site. we've heard a tracking group in the u.s. said it's primed and ready for nuclear test number six but this u.s. defense official now suggesting that the