The House impeachment inquiry will focus on "abuse of power" involving President Donald Trump's actions with Ukraine, though there is debate about the need for additional charges, according to multiple people who spoke with NBC News.

The impeachment probe is still underway in the House, and could continue into December as witnesses have provided more leads for investigators and some witnesses have had to reschedule interviews, per CNN.

House Speaker Nancy Pelosi, D-Calif., has refused to put a specific timeline on the investigation and last week said it will "depend on the truth line, and that's what we're looking for."

But the California lawmaker has been "hammering home" a focus on Trump's "abuse of power" as it "all fits to connect it and help the public understand," according to one person who spoke with NBC.

"What made it abusive is it was done in a way that betrayed the country and our national security interests and helped his own interests politically," said another source involved in the discussions.

A separate article on obstruction or contempt of Congress related to the Trump administration's refusal to comply with the investigation is also being considered by Pelosi.