believes the constitution gave him the power to fire former special counsel robert mueller. >> article two would have allowed me to fire him but i wasn't going to fire him. you know why? because i watched richard nixon go around firing everybody and that didn't work out too well. >> so your position is you could hire or fire anybody and start -- >> and that is the position of great lawyers. >> reporter: he repeatedly cited article two of the constitution but dodging questions about whether he believes the president is above the law. >> so a president can't obstruct justice. >> a president can run the country and that is what happened, georgia. i run the country and i do it well. >> if the president does it, it is not illegal. >> i'm saying the president under article two is strong. read it. >> reporter: and offering a window into his fixation on optics. trump snapping at his acting chief of staff mick mulvaney who interrupted him in the middle of an answer in which he claimed he might one day release his tax returns. >> at some point i might. but at some point i hope they