Ambassador Eric Edelman, a former undersecretary of defence who was among those former security officials to write an open letter against Mr Trump’s candidacy, said every administration suffered teething pains. But he said it seemed the situation currently playing out was different. For one thing, he said, it was unclear whether information from the NSC was making it onto Mr Trump’s desk. “It seems that in some of these calls with foreign leaders, he did not get the pre-brief,” he said. “It meant he was not prepared for things that might crop up.