there's anything to lend credibility or substantiate these very serious allegations. >> woodruff: john sipher saw that senator john mccain had a role, the republican senator, of course, from arizona, had a role in this. how did he come into this, and does that tell us anything? >> senator mccain, obviously, has a lot of experience working with the government on sensitive things and has always been a hawk on russia issues. i'm supportive of that. i think he's been good in that case. my understanding is the author of this himself provided information, this information to get to the f.b.i. through mr. mccain who got the information through the f.b.i. and obviously, other news places had it. what's interesting is president trump, president-elect trump seems tong the intelligence agencies themselves leaked this information whereas it doesn't seem to me that's the case, the fact that you and others have had this for so long and actually held off on putting it, suggests to me that this information has been out there for a while, and i think that's why general clapper and others briefed the president