They trained their fire more sharply on Democrats and other perceived opponents of Mr. Trump. Republicans dinged the Obama administration for a “slow and inconsistent” response to Russia’s active measures. And they admonished the campaign of Hillary Clinton and the Democratic National Committee for hiring Fusion GPS, a research firm, to investigate ties between Trump associates and Russia.
The firm in turn hired Christopher Steele, a former British spy, who produced a salacious dossier outlining a conspiracy between the campaign and the Russians.
Republicans had released key findings from the report in March. The full report, heavily blacked out in parts by American intelligence agencies, includes recommendations on issues as diverse as cyber and election security and a recommendation that the executive branch consider administering mandatory polygraph tests to political appointees with top-secret security clearances who are not confirmed by the Senate.
Though they absolved the Trump campaign, the Republicans warned that the government of President Vladimir V. Putin of Russia would be back without significant deterrence efforts.
“Unless the cost-benefit equation of such operations changes significantly, the Putin regime and other hostile governments will continue to pursue these attacks against the United States and its allies,” they wrote.
The investigation was one of several by the government into Russian election interference and possible ties to the Trump campaign. The Justice Department’s special counsel investigation is continuing, and the Senate Intelligence Committee is moving forward in its own inquiry.
But the House investigation was from the beginning buffeted by politics.
Representative Devin Nunes, the California Republican who leads the committee, became a reliable ally for Mr. Trump who engaged in attempts to pin blame on Obama administration officials and so-called deep state bureaucrats to undermine Mr. Trump.
Republicans blamed their political opponents, especially Representative Adam B. Schiff of California, the committee’s top Democrat, for launching a partisan crusade against the White House and for too often litigating the committee’s internal disputes during national television appearances.
During open hearings, Republicans on the committee often seemed more interested in pursing leaks to the press than investigating Russia’s widespread efforts to sabotage the American election.