Sanders campaign slams Clinton for calling herself nominee
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Bernie SandersBernie SandersWarren raised more money from Big Tech employees than other 2020 Democrats: Report Krystal Ball reacts to Ocasio-Cortez endorsing Sanders: 'Class power over girl power' Saagar Enjeti praises Yang for bringing threat of automation to forefront at Ohio debate MORE’s presidential campaign on Thursday fired back at Hillary ClintonHillary Diane Rodham ClintonFarrow: Clinton staff raised concerns over Weinstein reporting Perry says Trump directed him to discuss Ukraine with Giuliani: report The Memo: Once the front-runner, Biden now vulnerable MORE after she said she will be the Democratic nominee for president.

In a statement, a spokesman for Sanders said millions of Americans have “growing doubts” about her candidacy.

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“In the past three weeks voters in Indiana, West Virginia and Oregon respectfully disagreed with Secretary Clinton," campaign spokesman Michael Briggs said in a statement. 

"We expect voters in the remaining eight contests also will disagree." 

The statement noted that many polls show Sanders performing better than Clinton in a head-to-head matchup against Donald TrumpDonald John TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' MORE, the presumptive Republican nominee.

"With almost every national and state poll showing Sen. Sanders doing much, much better than Secretary Clinton against Donald Trump, it is clear that millions of Americans have growing doubts about the Clinton campaign," Briggs added.  

Clinton told CNN earlier Thursday that there was "no way" she would lose the nomination to Sanders. 
 
"I will be the nominee for my party, Chris. That is already done in effect. There is no way I won't be," she said. 
 
Clinton leads Sanders in pledged delegates by almost 300, according to The Associated Press. That lead swells larger when superdelegates — the party leaders with a vote on the convention floor — are included. 

With superdelegates included, Clinton is just 90 delegates short of the nomination, which means she's all but certain to clinch by the next round of voting on June 7. 

Sanders’s only plausible path to victory is convincing superdelegates backing Clinton to flip and back him instead.

The sparring by the two Democratic campaigns comes at the end of a contentious week as Democrats fought over the fallout related to the Nevada Democratic Convention.

Clinton allies and the Democratic National Committee accused Sanders supporters of threatening opponents and rioting at the event, while Sanders came to their defense by arguing that the party establishment is working to shut his supporters out.