What does Mueller's denial on BuzzFeed's Cohen-Trump story mean?

We're all left with unanswered questions while trying to parse Mueller's denial of the BuzzFeed News report alleging Trump told Cohen to lie to Congress. Fmr. federal prosecutor Cynthia Alksne & fmr. Asst. Watergate Special Prosecutor Jill Wine-Banks discuss.Jan. 19, 2019