Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Sunday said many of former presidential candidate Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE's supporters agree with the Republican nominee's trade policies — a tweet that comes a day after the Vermont senator's campaign tweeted that Trump was a "pathological liar."

ADVERTISEMENT

"Many on the team and staff of Bernie Sanders have been treated badly by the Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE campaign - and they like Trump on trade, a lot," Trump tweeted Sunday.

Many on the team and staff of Bernie Sanders have been treated badly by the Hillary Clinton campaign - and they like Trump on trade, a lot! — Donald J. Trump (@realDonaldTrump) September 25, 2016

Trump then tweeted that Sanders "gave" Clinton the Democratic presidential nomination when "he gave up on the e-mails.

Bernie Sanders gave Hillary the Dem nomination when he gave up on the e-mails. That issue has only gotten bigger! — Donald J. Trump (@realDonaldTrump) September 25, 2016

Sanders's campaign on Saturday tweeted a link to an article from The New York Times, titled "A Week of Whoppers from Donald Trump," and called the GOP nominee a pathological liar.

Donald Trump is a pathological liar. https://t.co/4iU3Lj10nG — Bernie Sanders (@BernieSanders) September 24, 2016

Earlier this month, Sanders slammed Trump in an interview, saying a Trump presidency would be an "absolute disaster."

"It would be beyond a disaster. Therefore, as a United States senator, I’ve got to do everything that I can to make sure that Trump does not become president," Sanders said in the interview, before going on to tout Clinton as the better choice.

After Clinton became the Democratic Party's presumptive presidential nominee, Trump attempted to appeal to Sanders supporters.

Over the past few months, Sanders has gone out on the campaign trail for Clinton.

--This report was updated at 11:43 a.m.