Disregarding the circumstances of the war, I hope that any U.S. President would interrupt any lecture to take care of any foreign head-of-state.
You can always reconvene a lecture, who knows the urgency of the phone call.
Upon receiving word that the US was planning to vote in favor of the resolution - viewed by Israel as impractical and failing to address its security concerns - Olmert demanded to get Bush on the phone, and refused to back down after being told that the president was delivering a lecture in Philadelphia. Bush interrupted his lecture to answer Olmert's call, the premier said.
We are dealing with brutal terrorist organizations devoid of the compassion and tolerance which characterize us.