Elijah Cummings said he wants to learn what he can, and who knows whether that leads to impeachment.
"Mr. Speaker, our democracy is at risk", Green continued, citing Trump's recent firing of Federal Bureau of Investigation director James Comey along with his latest tweets.
"We've been betting on impeachment for all recent USA presidents but, even at the height of the Lewinsky scandal, Bill Clinton was only ever 6-1 to be impeached", Price said, as cited by brocker.org.
Democrats, meanwhile, are using their meagre minority power to push the White House to release transcripts of the Oval Office conversation with Russian officials, and to release any tapes of Comey talking to Trump - the existence of which the president has hinted at. When Richard M. Nixon left office in 1974, he faced nearly certain impeachment, and likewise nearly certain removal from office.
Here is a look at the rarely used tool to oust a sitting USA president from power.
Impeachment is a two-step process. His opponents say he's unfit for office, but that's a judgment call, not a standard by which presidents can be impeached. Each article of impeachment requires a simple majority vote.
Soon thereafter another Republican lawmaker was seen supporting the impeachment move.
"Has the President committed offenses, and planned, and directed, and acquiesced in a course of conduct which the Constitution will not tolerate?"
The case went to trial in the Senate and the legislative body held a vote.
What's the role of the courts?
Donald Trump gave vent to frustrations over his mounting political problems on Wednesday, declaring that no president in USA history had been treated "more unfairly".
"They are the ultimate judge of what meets that standard".
Impeachment therefore is at the crossroads of politics and the law.
"And despite the short price on offer, money has poured in for the president to be impeached, leaving us with little option but to cut the odds, " she added.
How far along are we?
The strategy to avoid "Dump Trump" talk is such a deliberate stance that when Rep. Al Green (D-Texas) took to the House floor Wednesday to call for impeachment, he ended by noting his was a "voice in the wilderness", at least for now.
Green, who previewed his call with a tweet earlier, said it was the House of Representative's "duty" to take up impeachment. "Mr. Speaker, the American people are a part of this democracy". Only eight people have been impeached in the House and convicted in the Senate - all federal judges.
Bill Clinton became the second president to be impeached, in 1998, as the Monica Lewinsky scandal unfolded.
Markets were rattled by reports Trump had pressed sacked Federal Bureau of Investigation director James Comey to drop a probe into Russia's influence on the 2016 election.
In a meeting with Russian diplomats this week, Trump said that firing Comey took the heat off the Russia investigation. He was the first Republican lawmaker to raise the possibility publicly.
Comey is sworn in prior to testifying before the Senate Judiciary Committee on Capitol Hill in Washington, DC.