Grant Reeher, professor of political science and director of the Campbell Public Affairs Institute, says a primary challenge to Trump would be futile unless Republicans could "have an agreed-upon person that's going to represent that challenge."

"Egypt might be a particularly fruitful pressure point in applying pressure to North Korea," says Fred Carriere, research professor of political science. "There may be other motivations, but this move would certainly be the latest in a pattern of applying pressure to North Korea."

 According to Grant Reeher, professor of political science and director of the Campbell Public Affairs Institute, the timing of Trump's plan to speak on Afghanistan "feels a little like a ‘wag the dog' type of effort at distraction."