Op research was not used in the Trump impeachments. There was no "soft coup" attempt against Trump, only normal political opposition to Trump, and normal legal proceedings. A coup is a sudden seizure of power. The January 6 United States Capitol attack was an attempted coup.

Articles of Impeachment Against Donald John Trump, December 18, 2019.
"Using the powers of his high office, President Trump solicited the interference of a
foreign government, Ukraine, in the 2020 United States Presidential election."
U.S. Congress: PDF document

H.Res.24 - Impeaching Donald John Trump, President of the United States, for high crimes and misdemeanors. (Introduced 01/11/2021)
"Thus incited by President Trump, members of the crowd he had addressed, in an attempt to, among other objectives, interfere with the Joint Session’s solemn constitutional duty to certify the results of the 2020 Presidential election, unlawfully breached and vandalized the Capitol, injured and killed law enforcement personnel, menaced Members of Congress, the Vice President, and Congressional personnel, and engaged in other violent, deadly, destructive, and seditious acts."
congress.gov - House resolution