Chuck Grassley actually said...

Congress was not provided the legally required 30-day notice and case-specific reasons for removal, as required by law.

The only thing I don’t like about the way we had this mass firing is the law that says that Congress should get notified 30 days ahead of ti...

I just did, by talking to you.

While IGs aren't immune from committing acts requiring their removal and they can be removed by the president, the law must be followed.