Russian President Vladimir Putin says is far-fetched and that the US Senate will reject the motion.
Mr Putin said on Thursday at his annual news conference in Moscow that the move is a continuation of the Democrats' fight against Mr Trump.
"The party that lost the election is continuing the fight by other means," Mr Putin said.
President Donald Trump arrives at a campaign rally. Source: AAP
He likened Mr Trump's impeachment to the earlier US probe into collusion with Russia, which Mr Putin downplayed as being groundless.
Mr Putin noted that the impeachment motion "is yet to pass the Senate where the Republicans have a majority."
He added that "they will be unlikely to remove a representative of their own party from office on what seems to me an absolutely far-fetched reason".
Mr Trump was impeached by the US House of Representatives, becoming only the third American chief executive to be formally charged under the Constitution's ultimate remedy for high crimes and misdemeanors.
The historic vote split along party lines Wednesday night in the US, much the way it has divided the nation, over a charge that the 45th president abused the power of his office by enlisting a foreign government to investigate a political rival ahead of the 2020 election.
The House then approved a second charge, that he obstructed Congress in its investigation.
