Supreme Court Pick: Stay on Your Toes

Today could be the day.

Both President Barack Obama and Vice President Joe Biden are in town this morning. Both head out to the West Coast this afternoon (on separate trips).

So there’s a window of opportunity.

As of late last night the president had not made a final decision.

Top Senate leaders had not been given a heads up. But the rollout out team is ready to go when Obama pulls the trigger, and administration official tells me "stay on your toes."

Watch my chat on this with Diane Sawyer from GMA this morning.

–George Stephanopoulos