Paul Begala actually said...

You can't refuse a subpoena. This is still supposed to be the rule of law. When you're subpoenaed, you have to show.

He has an obligation. You can't refuse a subpoena. This is still supposed to be the rule of law. When you're subpoenaed, you have to show.

That now we have not just hearsay but allegedly a first-person witness, who can put the president in the position of personally ordering up ...

The Senate is full of Republicans as well as Democrats who helped craft that whistleblower law, most particularly Chuck Grassley.