doctors without borders
The weekend attack in the northern city of Kunduz killed at least 22 people.
The raid hints at a motive for the strike.
Defense Secretary Ash Carter said the Pentagon "deeply regrets" the loss of life.
WHAT'S HAPPENING
"We are working on the presumption of a war crime."
Progressives will need Republicans to defeat the Trans-Pacific Partnership.
NATO forces struck two oil tankers, killing about 100 people, in the same town where the Doctors Without Borders hospital was hit.
"I just can't tell you what the connection is at this time."
He suggested the tragedy could have been avoided with more U.S. involvement.
