Not an easy question. It must take into account some evidence of high crimes and misdemeanors in order to override privilege. I offer a balanced approach with steps and interbranch dialogue here.
shugerblog.com/2019/01/13/can…
1) Any president who has crossed a probable cause threshold to lose this kind of executive privilege for foreign contacts has *also* crossed the threshold for high crimes and misdemeanors and Senate removal...
...perhaps followed by indictment of sitting president.
@pwnallthethings @EricColumbus @AshaRangappa_ slate.com/news-and-polit…