The report by the Senate Intelligence Committee, totaling nearly 1,000 pages, provided a bipartisan Senate imprimatur for an extraordinary set of facts: The Russian government undertook an extensive campaign to try to sabotage the 2016 American election to help Mr. Trump become president, and some members of Mr. Trump’s circle of advisers were open to the help from an American adversary…

Like the investigation led by the special counsel, Robert S. Mueller III, who released his findings in April 2019, the Senate report did not conclude that the Trump campaign engaged in a coordinated conspiracy with the Russian government — a fact that Republicans seized on to argue that there was “no collusion.”

But the report showed extensive evidence of contacts between Trump campaign advisers and people tied to the Kremlin — including a longstanding associate of the onetime Trump campaign chairman Paul Manafort, Konstantin V. Kilimnik, whom the report identifies as a “Russian intelligence officer.”…

Democrats also laid out a potentially explosive detail: that investigators had uncovered information possibly tying Mr. Kilimnik to Russia’s major election interference operations conducted by the intelligence service known as the G.R.U.