you've spoken about setting conditions for success in advance of president trump's meeting with kim jong-un and i am right now very concerned that the lack of a coherent policy in north korea could lead to a very poor meeting. if that meeting goes poorly, some might reach the conclusion that economic pressure and diplomatic engagement have va failed. national security advisor has outlined the case for military strikes on north korea. are there any conditions under which you would support preventative military strikes against north korea as secretary of state. >> senator, thanks for your question. that phrase prevented military strikes has a long history. lot of folks have different views. there's a legal view. there'spreemption.