"An appeals court has suspended Rudy Giuliani from practising law in New York because he made false statements while trying to get courts to overturn Donald Trump's loss in the presidential race.
An attorney disciplinary committee said in its motion to suspend Mr Giuliani's license that there was "uncontroverted evidence" that he had made false statements to the courts, the public and lawmakers as he pushed theories that the election was stolen through fraud.
"This country is being torn apart by continued attacks on the legitimacy of the 2020 election and of our current president, Joseph R. Biden," the committee wrote, on Thursday (Friday AEST).
"The hallmark of our democracy is predicated on free and fair elections.
"False statements intended to foment a loss of confidence in our elections and resulting loss of confidence in government generally damage the proper functioning of a free society."
The ruling, signed Thursday, will prevent Mr Giuliani from representing clients as a lawyer.
In the decision, the committee wrote that Mr Giuliani "communicated demonstrably false and misleading statements to courts, lawmakers and the public at large" as a lawyer for Mr Trump.
Mr Giuliani had claimed the investigation into his conduct violated his First Amendment right of free speech and that he did not knowingly make false statements, according to the decision.
The court rejected those arguments, noting that in Pennsylvania, Mr Giuliani failed to "provide a scintilla of evidence for any of the varying and wildly inconsistent numbers of dead people he factually represented voted in Philadelphia during the 2020 presidential election."
A message seeking comment about the ruling was sent on Thursday to Mr Giuliani and his lawyer.
Mr Giuliani was the primary mouthpiece for Mr Trump's lies after the 2020 election, standing at a press conference in front of Four Seasons Total Landscaping outside Philadelphia on the day the race was called for Biden and saying they would challenge what he claimed was a vast conspiracy by Democrats.
The lies around the 2020 election helped push an angry mob of pro-Trump rioters to storm the US Capitol on January 6 in a shocking effort to stop the certification of President Biden's victory.
Since that time, Republicans have used that lie to push stricter voting laws nationwide."