The Speaker of the House of Representatives did not choose the term at random: this is one of the charges cited by the Constitution to justify impeachment.

The leader of the Democrats in the US Congress, Nancy Pelosi, for the first time used Thursday, November 14 the term of " corruption " to indicate the suspicions hanging over the American president, who was the subject of an impeachment investigation in the Ukrainian case.
Speaking the day after the televised interviews of senior diplomats organized as part of this explosive investigation, Mme Pelosi did not choose his words randomly: the " corruption " is one of the charges cited by the US Constitution to justify impeachment. "The overwhelming evidence corroborated the evidence of corruption uncovered by the investigation"said the Democratic Speaker of the House of Representatives during a press conference. She added that the facts presented the previous day showed that "Almost small" those reproached to Republican President Richard Nixon, also targeted by an investigation into dismissal in 1974.
Abuse of power
Democrats suspect Donald Trump of abusing his presidential powers by asking Ukrainian President Volodymyr Zelensky to investigate Joe Biden, well placed to face him in the US presidential election in 2020. They are trying to demonstrate that he has more to obtain it, put pressure on Kiev by freezing a large military aid intended for Ukraine.
For Nancy Pelosi, corruption consists of "Grant or suspend military aid in exchange for a public statement regarding a false election inquiry", which represented "An obvious attempt on the part of the president to give himself the advantage for the 2020 election". Donald Trump says his conversation with his Ukrainian counterpart was perfect. An argument repeated by a large majority of Republican parliamentarians who stand behind him.
Sustained tempo
With a dozen public hearings scheduled by November 20, Democrats report that they do not want to waste time in the investigation, before a possible vote on the indictment, the"Impeachment" in English, from the Speaker to the House. "We have not decided yet that we are going to charge (the president), said Mme Pelosi Thursday. That's what this survey is for. " Given the Republican majority in the Senate, it is unlikely that Donald Trump is then dismissed, because the upper house, which would be responsible for judging, would have the last word.
On Friday, parliamentarians will question, during a public hearing, the former US ambassador to Kiev, Marie Yovanovitch, who was abruptly relieved of his duties in the spring after being the subject of a hostile campaign led by the Donald Trump's personal attorney, Rudy Giuliani. A diplomat who would have heard Donald Trump speak to one of his ambassadors "Claimed investigations" to Ukraine should also testify, but in camera, according to US media.