The New York Times reports over an elegant dinner at his official residence Monday night, Ron Dermer, the Israeli ambassador to the United States, tried to reassure a group of congressional Democrats that the dramatic public break between President Obama and Prime Minister Benjamin Netanyahu was nothing more than a passing disagreement. Every American president since Harry S. Truman has had differences with Israel, Dermer told the group, and they always work themselves out. The gathering was part of a bid by Dermer, the American-born former Republican operative who is so close to Netanyahu that he is often referred to as “Bibi’s brain,” to smooth tensions that have flared up in recent weeks between the United States and Israel. But an apology tour it is not. If anything, Dermer is intensifying his efforts to thwart the nuclear deal with Iran that Obama is working hard to close within days.