The Richard Nixon Foundation last Tuesday convened its (nominally bipartisan) Grand Strategy Summit, where President Trump’s former National Security Adviser Robert O’Brien gave a little interview at the start. He tried to balance his own realist instinct to align with the crowd, which were more traditional institutional republican. The result was a slightly jarring mismatch in tone, especially for those who have seen the other speakers and panelists, which included Matthew Continetti, Carrie Filipetti, and Eli Lake, ta …