WASHINGTON — Even as the special counsel expands his inquiry and pursues criminal charges against at least four Trump associates, House Intelligence Committee Republicans said on Monday that their investigation had found no evidence of collusion between Donald J. Trump’s presidential campaign and Russia to sway the 2016 election.

Representative K. Michael Conaway, the Texas Republican who is leading the investigation, said committee Republicans agreed with the conclusions of American intelligence agencies that Russia had interfered with the election, but they broke with the agencies on one crucial point: that the Russians had favored Mr. Trump’s candidacy.

“The bottom line: The Russians did commit active measures against our election in ’16, and we think they will do that in the future,” Mr. Conaway said. But, he added, “We disagree with the narrative that they were trying to help Trump.”

The announcement brought an abrupt end to one of two remaining investigations into the topic on Capitol Hill and quickly provoked sharp objections from committee Democrats, who have warned Republicans not to close the matter before the special counsel, Robert S. Mueller III, is done with his work.