november, 2019 and the withdrawal would take place a year after that. so this will become a major campaign issue, a major issue for the next u.s. presidential election and it could possibly be reversed. in any case, donald trump is not focusing on the basic issue of climate science at all at this moment, which is very interesting given his campaign rhetoric. >> it will certainly be a topic of the mid-terms in the united states as well. >> that's right. >> another question that won't go away, russia the question whether the united states president could use executive privilege to permit james comey from testifying. can the president use it to stop comey and what would the optics be if he were to do so? >> well, let's start with the optict. of course, for any leader or president who decide to block the testimony of a key former official in a congressional inquiry, in a legislative up query, that suggests, of course,