A sprawling report released Tuesday by a Republican-controlled Senate panel that spent three years investigating Russia’s 2016 election interference laid out an extensive web of contacts between Trump campaign advisers and Russian government officials and other Russians, including some with ties to the country’s intelligence services.

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.