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U.S. President Donald Trump was quick to send out “congratulations” to newly-elected Democratic National Committee Chairman Thomas Perez on Saturday evening.

“I could not be happier for him, or for the Republican Party!” Trump said.

Congratulations to Thomas Perez, who has just been named Chairman of the DNC. I could not be happier for him, or for the Republican Party! — Donald J. Trump (@realDonaldTrump) February 25, 2017

Perez was quick to fire back, warning Trump that the Democrats will be Trump’s “worst nightmare.”

Call me Tom. And don't get too happy. @keithellison and I, and Democrats united across the country, will be your worst nightmare. https://t.co/fu7WvLofrD — Tom Perez (@TomPerez) February 25, 2017

Trump was back at it again Sunday as he claimed the race was rigged against Bernie Sanders’ candidate, Keith Ellison, who finished second.

The race for DNC Chairman was, of course, totally "rigged." Bernie's guy, like Bernie himself, never had a chance. Clinton demanded Perez! — Donald J. Trump (@realDonaldTrump) February 26, 2017

Sanders appeared on CNN Sunday morning and refuted Trump’s claim.

“No, he doesn’t have a point,” Sanders stated. “That’s what the system is.”

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He went on to say Ellison needs to work to change the system.

WATCH: Bernie Sanders calls US President Donald Trump a ‘pathological liar’

1:08 Bernie Sanders calls US President Donald Trump a ‘pathological liar’ Bernie Sanders calls US President Donald Trump a ‘pathological liar’

Several times during the 2016 presidential campaign Trump declared the race to be the Democratic nominee for president was rigged against Sanders by Hillary Clinton and the Democratic establishment.

Clinton did not declare support for a candidate but is reported to be close friends with Perez.

Perez replaces Debbie Wasserman Schultz, who was forced to resign from the post just ahead of the Democratic convention in late July after hacked emails appeared to show party officials favouring Clinton.

WATCH: Trump reiterates belief in massive voter fraud in 2016 election despite data

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1:20 Trump reiterates belief in massive voter fraud in 2016 election despite data Trump reiterates belief in massive voter fraud in 2016 election despite data

Wasserman Schultz joined Clinton’s campaign team within days of the convention.

Trump also declared the U.S. electoral process was rigged right into his final campaign stop in Florida.

WATCH: Trump ramps up ‘rigged system’ claims on final day of campaigning

1:38 Trump ramps up ‘rigged system’ claims on final day of campaigning Trump ramps up ‘rigged system’ claims on final day of campaigning

Since winning the presidency, Trump has said on multiple occasions that 3-5 million people voted illegally in the U.S. election.

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