The UK Ambassador to the US resigns after secret cables in which he described President Trump as "incompetent" and "inept" leaked to the Daily Mail. There's speculation that the leak was a politically motivated act by someone in London aiming to open up the post for an outspoken pro-Brexit official - and a source tells CNN the incident has already led to a "chilling effect" among the diplomatic community. CNN Political Commentator Doug Heye joins SE to discuss what this means for America's alliances and for the US-UK relationship in this perilous moment.