Washington Post foreign affairs columnist David Ignatius on the President in Asia, the Russia investigation and his new thriller, “The Quantum Spy.” He joins us.

We’ve got a world in motion right now in a whole lot of power centers.  A purge of princes in Saudi Arabia.  North Korea threatening nuclear hellfire.  A US president threatening back.  Russia under investigation in Washington.  China, going openly now for global eminence.  Washington Post foreign affairs writer David Ignatius is watching it all.  And he’s written a new thriller on US and Chinese spies duking it out for dominance.  This hour, On Point:  David Ignatius, on the world we see and the world we don’t. --Tom Ashbrook

David Ignatius, foreign affairs columnist for the Washington Post and author of "The Quantum Spy." (@IgnatiusPost)

Bradley Martin, North Korea watcher and author of the new novel "Nuclear Blues." (@bradleykmartin)