Transcript for Attorney General William Barr to face lawmakers
As Jon mentioned, the department of homeland security hit hardest. Ten of the top positions at the department including the head of disaster assistance, and the board all vacant right now, drawing sharp reaction. I want to bring in our senior congressional correspondent Mary even the president's allies are speaking out on this. Reporter: Republicans are clearly alarmed by this chaos at dhs, and we are hearing from even some of the president's top allies. They are warning the president to not fire more top officials and saying the white house needs to be clear in what it wants to do on immigration. Senator chuck grassley, the senior senate Republican is making this personal, warning the white house not to fire the director of citizenship and immigration, and there is clearly no love lost from chairman grassley when it comes to Steven Miller, the white house adviser who is thought to be pushing many of these changes. He was reportedly said, quote, I think it would be hard for Miller to demonstrate he has accomplished anything for the president. You are on capitol hill where William Barr is expected to testify today. He's going to get tough questions today on the Mueller report. Reporter: In just a few hours, the attorney general will be sitting here likely facing questions for the first time about the Mueller report, but this is not the setting you would expect. This is the hearing on a budget from 13 members of an appropriation sub committee. They want to hear about how Barr developed that four-page summary of the Mueller report. The chairman will call that, quote, suspicious and question how he developed that. They want to know why he was able to come to the conclusion there was no obstruction of justice even though the Mueller report said it did not exonerate the president. He plans to release a redacted version of the report some time Robin? There are new developments
This transcript has been automatically generated and may not be 100% accurate.