Republican National Committee chairwoman Ronna McDaniel accused Democrats of conducting a three-year "smear campaign to invalidate the will of the American people."
Her comments came in a Wednesday tweet as House members debated President Donald Trump's impeachment.
She wrote: "Today is the culmination of a 3-year-long smear campaign to invalidate the will of the American people. Democrats want nothing more than to undercut @realDonaldTrump. Their tactics aren't working. The American people see through this sham!"