This is stated in a statement by Pelosi, published on its official website.
According to her, Trump and representatives of the Senate from the Republican Party "made lawlessness the norm and rejected the system of checks and balances of the Constitution."
“The president remains a constant threat to American democracy because he insists that he is above the law and that he can corrupt the elections if he wants,” Pelosi said.
Earlier, the US Senate by a majority vote as part of the impeachment procedure declared Trump not guilty under two charges. Thus, Trump remains the president.
The White House then stated that the Democrats were using impeachment procedures to intervene in the upcoming 2020 US presidential election.