President Obama's State of the Union preparations were sidetracked Tuesday morning with news from North Korean state media that the nation had successfully detonated a nuclear device at a test site on the country. The president said in a statement that the recent action by Kim Jong Un and his government warrants "swift and credible action".
In the opinion pages: Israel Ambassador Michael Oren details a growing threat in Iran. The New York Times' Frank Bruni gives some of the nation's leading lawmakers a "signature scent".
Here's your State of the Union prep: Politico's Carrie Budoff Brown and Reid Epstein run through five things to watch for during Tuesday night's address.