I really don't know what they care about. Foreign interference is generally where the issue lies.

Impeachment inquiry goes far beyond that tho. Abusing national security systems to hide "bad" calls, having a private citizens acting on behalf of the government, pushing foreign countries to spend money at businesses he owns, not complying with oversight.

You know. As Lindsey Graham put it..."The day Richard Nixon failed to answer that subpoena is the day he was subject to impeachment because he took the power from Congress over the impeachment process away from Congress, and he became the judge and jury"