Guard troops pour into Washington as states answer the call

With the U.S. Capitol in the background, members of the National Guard change shifts Saturday as they exit through anti-scaling security fencing in Washington. (AP Photo/Jacquelyn Martin)

WASHINGTON — By the busload and planeload, National Guard troops were pouring into the nation’s capital on Saturday, as governors answered the urgent pleas of U.S. defense officials for more troops to help safeguard Washington even as they keep anxious eyes on possible violent protests in their own states.