WATCH: What is a designated survivor?
Trump's theme for the speech is "building a safe, strong and proud America." White House officials say the address will have a bipartisan tone. But Trump frequently speaks off the cuff, even during scripted speeches, so it's worth keeping an eye on.
Trump's speech was written by senior administration officials including Vice President Mike Pence, National Security Adviser H.R. McMaster, senior policy adviser Stephen Miller, economic adviser Gary Cohn, and others.