Donald Trump. AP

President-elect Donald Trump lashed out at Rep. John Lewis on Saturday morning, telling the Georgia Democrat to "spend more time on fixing and helping his district."

"Congressman John Lewis should spend more time on fixing and helping his district, which is in horrible shape and falling apart (not to ... mention crime infested) rather than falsely complaining about the election results. All talk, talk, talk — no action or results. Sad!" Trump said as part of a Saturday morning tweetstorm.

Lewis, a former civil-rights leader who has served in Congress since 1987, called Trump an "illegitimate president-elect" during a "Meet the Press" interview with NBC's Chuck Todd set to air on Sunday. Lewis pointed to allegations of Russian hacking in the election, as well as a dossier of unverified, salacious claims about Trump's potential ties to Russia.

Lewis's district contains most of Atlanta, Georgia's capital and largest city.

"The Russians participated in helping this man get elected, and they helped destroy the candidacy of Hillary Clinton," Lewis told Todd.

As part of his Twitter storm Saturday, Trump lashed out at the dossier, which was compiled by a former British intelligence official and published in full by BuzzFeed last week. He cited One America News Network, a conservative-leaning outlet.

"INTELLIGENCE INSIDERS NOW CLAIM THE TRUMP DOSSIER IS "A COMPLETE FRAUD!" @OANN," Trump tweeted on Saturday.

Lewis, for his part, said that he won't be attending Trump's inauguration.

"You cannot be at home with something that you feel that is wrong," Lewis told NBC's Todd.

Here are the tweets: