President Trump just put the entire country on notice: clear Thursday night at 9 p.m. Eastern. The White House has scheduled a rare primetime address to the nation, and the president initially offered no hint about the subject. In a terse official announcement, President Trump said he will deliver the speech Thursday evening and thanked Americans for their attention to the matter. The post went live at 1:45 p.m. Eastern on Monday. It named the date and time, but revealed nothing about what the president intends to tell the country. That silence immediately raised the stakes. Presidents do not reserve a national television audience for routine housekeeping. A formal address can signal a major policy decision, a national-security development or the release of information the White House believes every American needs to hear at once. Here is the announcement that sent speculation into overdrive: