Us. >> thanks for having me. it's good to be here. ainsley: why do you think this is something the president can do or should do. >> first of all, there are three ways an individual can lose a security clearance. first, determination of the issuing agency they can revoke it. the second means is by national security interests. and the third, because the president does have final authority on all national security matters and security clearances, he can unilaterally then revoke a security clearance. however, he should be able to identify a specific offense which justifies revoking that, the revo...