democracy from an invasion, cyber invasion by the russians and sendly, his credibility has been destroyed. >> for more, i want to bring in chief legal correspondent arimelber, may be obstructing justice. what qualifies as obstruction of justice? what's the legal qualifications? >> the legal standard for obstructing justice in this manner, being in a supervisory role would be to impede or interfere with an investigation. a classic example would be going to a witness or subject and telling them not to talk or the saturday night massacre, where you have the idea of removing people to end a criminal inqu y inquiry. >> there have been people that have suggested it is obstruction or could be part of an obstruction case, this tweet by the president today which some are viewing as a threat. >> this is where we have judgment and we have the law. the tweet that the president sent was probably misleading if there are no tapes and it was in