JUDY WOODRUFF:

Now back to the controversies swirling around Donald Trump Jr. and the president's top campaign aides.

The e-mail exchange published by Donald Trump Jr. on Tuesday reignited a legal debate about whether members of the Trump campaign engaged in unlawful activity.

We get two perspectives now, from Bob Bauer. He served as White House counsel to President Obama from 2009 to 2011. He is now a lawyer in private practice in Washington. And Jed Shugerman, He's a professor at Fordham University Law School.

Gentlemen, we thank you both for being with us.

Bob Bauer, to you first.

We know the president's son was told that the Russian government had incriminating information on Hillary Clinton that it wanted to share with him. Did he break a law by pursuing that?