As part of his Sunday Twitter meltdown over requests for a recount of the 2016 vote in certain states, President-elect Donald Trump falsely claimed that “millions of people” voted “illegally” for Democratic nominee Hillary Clinton, which is why he lost the popular vote by more than two million votes.

“In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally,” he tweeted Sunday afternoon.

In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally

— Donald J. Trump (@realDonaldTrump) November 27, 2016

“Illegal aliens” voting for Clinton was a popular right-wing bugaboo in the lead-up to the election. Hucksters like James O’Keefe of Project Veritas and conspiracy monger Alex Jones fraudulently alleged that busloads of Mexican citizens were being brought in to vote for Clinton.

Trump appears to have taken those reports as gospel and Twitter users let him have it.

@realDonaldTrump This is a wild accusation. Where is evidence to back it up?

— David Fishman (@davidpkfishman) November 27, 2016

@davidpkfishman @realDonaldTrump this man said Ted Cruz's dad was involved in the JFK assassination. Really think he cares about facts? lol

— Josh Sánchez (@jnsanchez) November 27, 2016

@realDonaldTrump you are not uniting the country, by questioning the electorate you are ripping us apart.

— Al Letson (@Al_Letson) November 27, 2016

Hey Donald – it’s over. You won. You don’t have to keep lying to your delusional followers any more @realDonaldTrump https://t.co/1GrPA02kok

— Charles Johnson (@Green_Footballs) November 27, 2016

Donny "Tiny Hands" #Trump says that a recount is ridiculous and a scam, but also claims that millions of people voted illegally #LoserDonald

— Rhiannon Kate (@rhiannon_kate_) November 27, 2016

So Comey and Putin installed a crazy, vindictive can't-handle-the-truth person in the White House. Scary. pic.twitter.com/pr3WPT9HYH

— Paul Krugman (@paulkrugman) November 27, 2016

Trump’s claim that “millions” of people voted illegally may have come from Infowars, the most popular commentary site amongst his supporters pic.twitter.com/qbQGNEunga

— Jonathon Morgan (@jonathonmorgan) November 27, 2016

'Trump, without evidence, claims 'millions of people who voted illegally' cost … https://t.co/ZSgaMKcXrk via @Gong pic.twitter.com/8YGm640vo9

— GONG (@GONG) November 27, 2016

Wow, even Trump admits millions of people voted illegally, he just doesn't say who they voted for. #AuditTheVote

— Missy McMurray (@diamonddarling) November 27, 2016

@realDonaldTrump oh PLEASE.

— Emma Kennedy (@EmmaKennedy) November 27, 2016

@realDonaldTrump King of the Clown Show. You LOST the popular vote. Crushed in fact.

— Jeremy Pond (@JeremyPond) November 27, 2016

Hi I'm Donald Trump and instead of trying to come up with proactive solutions to unite our country I've decided to start a Twitter fight :)

— Taryn Adams (@211Taryn) November 27, 2016

Dear Donald Trump, can you at least TRY and behave like a president and not a whiny child? #NotMyPresident

— Nicole Pollack (@nicolekpollack1) November 27, 2016

So this is what @KellyannePolls meant when she said Trump gets intelligence from other sources. https://t.co/maq9hnQmB8

— Jason Sparks (@sparksjls) November 27, 2016

Trump doesn't care if we think he's telling the truth – he just wants his supporters to doubt that anyone's telling the truth.

— Jon Favreau (@jonfavs) November 27, 2016