From NBC News, this is Article 2, Inside Impeachment. I'm Steve Kurnaki. Today is Monday, October 28th, and here's what's happening.

Today Dr. Kupperman was scheduled to testify as part of the House impeachment inquiry

for a previously scheduled deposition and he was a no-show.

This is deeply regrettable.

House Intelligence Chairman Adam Schiff addressing the press there after Charles Cuperman failed to testify in the

Democrats impeachment investigation.

Cuperman is the former deputy national security advisor under John Bolton

and the two are longtime associates.

In not showing up,

Cuperman ignored a congressional subpoena.

His lawyer filed a lawsuit on Friday saying that

Cuperman was caught between Congress and the White House.

The suit asks the courts to decide whether Cuperman should testify.

Quote, plaintiff obviously cannot satisfy the competing demands of both the legislative and

executive branches and he is aware of no controlling judicial authority

definitely establishing which branches command should prevail the suit said.

Now it's safe to say most people probably haven't heard of cuperman before this week but

you probably have heard of John Bolton. Democrats say that Bolton's testimony would be key to

their impeachment investigation in this dispute with Charles

Cupperman could be pivotal in deciding whether Bolton actually does testify.

Garrett Hake is MS NBC's Washington correspondent.

He's also out there in his spare time covering the presidential candidates out on the

...