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It's Sunday, July 28th. I'm Margaret Brennan, and this is Base the Nation.

With Robert Mueller's testimony to Congress in the rear view mirror, Democrats are now even more divided about how or if they should move ahead with impeachment proceedings against President Trump.

These people are clowns.

The Democrats are clowns.

They're being laughed at all over the world.

Will the political noise distract from the serious warnings from Mueller about Russia's election meddling?

They're doing it as we sit here and they expect to do it during the next campaign.

Plus there are new developments on immigration as the Supreme Court gives Mr. Trump the

go ahead with his plan to divert military funds in order to build his wall between

the US and Mexico and he announces a controversial agreement with Guatemala to force people

traveling through that country to seek asylum there instead of the U.S.

Breaking this weekend, the president launches a Twitter attack on another minority member of Congress and his home district in Baltimore.

This time, the target is Elijah Cummings, a powerful committee chairman

who's criticized the administration's handling of detention center conditions.

Come on man, what's that about?

We'll talk with acting White House Chief of Staff Mick Mulvaney and the top Democrat on the Senate Intelligence Committee, Mark Warner.

Then, ahead of the second round of Democratic primary debates, we'll talk to two candidates who got a bump from the last one.

Former San Antonio Mayor Julian Castro and self-help author Marianne Williamson.

National Security correspondent David Martin looks at the build-up of US forces in the Persian

...