"I think we're all going to be held to account one day for what we did when our democracy is under threat," Representative Adam Schiff said.
If Trump tries to pardon whoever faces charges, he could several major hurdles.
The president's recent move on health care is just the latest example of his incompetence, according to Representative Adam Schiff, a top-ranking Democrat.
Senator Angus King estimates the probe is only a fifth of the way to completion.
"I'll beat your...ass," the broadcaster tells Adam Schiff, the top Intelligence Committee Democrat, on a YouTube video.
The documents are at the center of a political firestorm surrounding the investigation of possible links between President Donald Trump's campaign and Russia.
The president's tweets 'tell the story' of how he seeks to deflect attention, House Intelligence Committee Democrat says.
Adviser reiterates his offer to testify before the House Intelligence Committee.
The House Intelligence Committee has set a Monday deadline for Justice to turn over any evidence it may have related to the president's accusations.
On Wednesday, Schiff said the committee would investigate allegations of collusion between Republican Donald Trump's 2016 presidential campaign and Russia as part of its probe into allegations of Russian meddling in the election.
Adam Schiff expressed willingness to create ground rules for when tech firms should grant the authorities access to their products.