It was based on deep state lies:
"The Republican-led Senate Intelligence Committee submitted the first part of its five-volume report in July 2019 in which it concluded that the January 2017 Intelligence Community assessment alleging Russian interference was "coherent and well-constructed".
The first volume also concluded that the assessment was "proper", learning from analysts that there was "no politically motivated pressure to reach specific conclusions". The final and fifth volume, which was the result of three years of investigations, was released on August 18, 2020,[6] ending one of the United States "highest-profile congressional inquiries."[7][8] The Committee report found that the Russian government had engaged in an "extensive campaign" to sabotage the election in favor of Donald Trump, which included assistance from some of Trump's own advisers."
en.wikipedia.org
Now we know that Obama ordered the intelligence analysis to be changed.