As a result, the Democrats could impeach the Republican Trump with no Republican support.
"The facts are uncontested", Pelosi said on Thursday.
The House speaker added that Trump "has engaged in abuse of power, undermining our national security and jeopardizing the integrity of our elections". Therefore I say, if you are going to impeach me, do it now, fast, so we can have a fair trial in the Senate, and so that our Country can get back to business. If the House approves articles of impeachment, or formal charges, he or she would then be subject to trial in the US Senate.
Mr Biden responded to the President saying: "Impeachment is not 'lynching, ' it is part of our Constitution". Lawmakers are also examining whether the Republican conditioned a White House meeting or a military aid to Ukraine on those probes. That all changed in September when House Speaker Nancy Pelosi announced a narrow impeachment inquiry to investigate the Ukraine allegations, and almost every House Democrat publicly backed it. "We will win!" President Trump said.
"I was raised in a way that is a heart full of love and always pray for the president", she continued.
Want to find out more?
Pelosi didn't balk at this or any of Trump's previous threats, stating in her speech, "In the course of today's events, it becomes necessary for us to address, among other grievances, the president's failure to faithfully execute the law". If the revelations around the impeachment inquiry inspire five percent of his voters to abandon him next November, Trump would have a very hard time winning a second term.
Hours earlier, Pelosi had asked House committee chairs to draft the articles of President Trump's impeachment indictment to me on to the fourth phase of the process, The Hill reported.
Republicans accuse Democrats of conducting a politically motivated witch hunt aimed at ousting Trump.
The impeachment process began in September after an anonymous whistleblower complained to Congress about a July phone call by Mr Trump to the president of Ukraine, in which Mr Trump appeared to tie USA military assistance to Ukraine launching investigations which could help him politically. "I was raised in a Catholic house". "Can we just agree that people in power should never be asking anyone who they voted for?"
The probe is focusing on a July 25 telephone call in which Trump asked Ukrainian President Volodymyr Zelensky to open an investigation into Biden and his son Hunter and into a discredited theory promoted by Trump and his allies that Ukraine, not Russian Federation, meddled in the 2016 US election. Hunter joined the board of a Ukrainian energy company when Joe Biden was U.S. vice-president.
At the time of the call, the Trump administration was withholding almost $400m in military aid from Ukraine. This theory has been widely debunked, and USA intelligence agencies are unanimous in saying Moscow was behind the hacking of Democratic Party emails in 2016.
With Democrats moving forward with impeachment charges, here's a quick guide to how impeachment works, what happens next.
A Senate vote requires a two-thirds majority to convict and remove the president - unlikely in this case, given that Mr Trump's party controls the chamber.
Only two presidents have been impeached: Andrew Johnson in 1868, and Bill Clinton in 1998. Republican Richard Nixon resigned in 1974 after the House began the process in the Watergate corruption scandal.