Trump met with four possible candidates for national security adviser over the weekend: former Ambassador to the United Nations John Bolton, Lt. Gen. H.R. McMaster, Lt. Gen. Robert Caslen Jr. and retired General Keith Kellogg, who is currently serving as acting national security adviser. The meetings came after General Flynn resigned from the post last week over his December phone call discussing sanctions with the Russian ambassador, and Trump’s top pick for his replacement, retired Vice Admiral Robert Harward, turned down the position, reportedly telling a friend the offer amounted to a “s*** sandwich.”