House Intel Democrats are 'following the rubles' -- and it is driving Trump insane: MSNBC panel
President Donald Trump (Screen cap).

President Donald Trump is terrified by the House Intelligence Committee investigating his personal finances and what may be revealed in the probe.

The panel on MSNBC's "Hardball" with Chris Matthews on Thursday examined the legal liability facing Trump -- and how it may lead directly to impeachment.

"This is driving the president insane," Matthews said.

"I think it's not over-stating to say this is potentially the most threatening fight of the Trump presidency so far," Axios reporter Jonathan Swan said.

"Trump drew a very clear red line in The New York Times early in the administration saying if [Robert] Mueller approached his business affairs, his personal finances, it would be out of bounds," he reminded. "what they're most interested in are these extraordinary series purchases that ... Donald Trump made in the decade before he ran for president."

"I think you have to follow the rubles," suggested Rep. Raja Krishnamoorthi (D-IL), who sits on the House Oversight Committee.

"If it turns out the Russians had a hook in this president, the oligarchs, should he be removed from office?" Matthews asked.

"I think that crosses a red line, I think that would probably go to impeachment," Krishnamoorthi answered.

"There's a big question about why the president is handling himself the way he's handling himself and I think a lot of the answers are in his personal finances and how they're entangled with foreign actors," he added.