JUDY WOODRUFF:

But first: President Trump today faced questions from both parties over who will pay for his promised wall on the U.S.- Mexico border.

He's already pledged to hire thousands of new immigration agents, whose jurisdiction extends deep into the U.S. itself.

For Americans on the Southern border, interactions with Border Patrol vary. Some see an occasional inconvenience, others a daily torment.

William Brangham has story.