The President Tweets and the Secretary of State holds news conferences.  This is what passes for American foreign policy these days.  But back when the State department did diplomacy, there were heroes on the front lines. The Ambassadors is the title and subject of Paul Richter’s new book. In case you hadn’t noticed, the work Richter describes is something the Trump Administration has chosen not to do.  As some of the Ambassadors quoted in the book can tell you, disinvesting in diplomacy has `a high cost.