Sanders: Trump a 'pathological liar' over tax claim
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Sen. Bernie SandersBernard (Bernie) SandersWorld leaders reach agreement on trade deal without United States: report Sanders on Brazile revelations: DNC needs ‘far more transparency’ Sen. Warren sold out the DNC MORE (I-Vt.) is firing back at businessman Donald TrumpDonald John TrumpDems win from coast to coast Falwell after Gillespie loss: 'DC should annex' Northern Virginia Dems see gains in Virginia's House of Delegates MORE after the GOP front-runner suggested Sanders wants to increase tax rates to 90 percent. 

"It appears that Donald Trump, a pathological liar, simply cannot control himself. He lies, lies and lies again," Sanders, who is running for the Democratic nomination, said in a statement Wednesday. "Today, he repeated his lie that I want to raise taxes to 90 percent. Totally untrue."
 
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Sanders's comments come after Trump told supporters at a South Carolina campaign stop that "this guy wants to raise your taxes to 90 percent" and called the Vermont senator a "total disaster."
 
It's not the first time Trump has made the comment about Sanders. PolitiFact previously fact checked Trump's remarks in October, rating it as "pants on fire," or false. 
 
The two presidential hopefuls have been trading rhetorical barbs while also suggesting they could be able to poach each others supporters. 
 
Sanders's canvassers are being instructed to sell their candidate to Trump backers, according to a copy of a campaign script obtained by MSNBC. 
 
Sanders had made increasing taxes on wealthy Americans and large corporations central to both his presidential campaign and his time in the Senate, but he's repeatedly denied Trump's accusations. 
 
He added on Wednesday that "billionaires like Trump should pay their fair share of taxes."
 
"It is grossly unfair that there are millionaires in this country who take advantage of all kinds of loopholes and end up paying an effective tax rate lower than a middle-class worker," he said.