Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) fired back at President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Monday after the president said the 2020 presidential hopeful should be "labeled a Racist" for previously comparing Baltimore to a "Third World country."

"Trump's lies and racism never end," Sanders tweeted. "While I have been fighting to lift the people of Baltimore and elsewhere out of poverty with good paying jobs, housing and health care, he has been attacking workers and the poor."

Trump's lies and racism never end.



While I have been fighting to lift the people of Baltimore and elsewhere out of poverty with good paying jobs, housing and health care, he has been attacking workers and the poor. https://t.co/7N0K4GQgEO — Bernie Sanders (@BernieSanders) July 29, 2019

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Trump tweeted Monday morning "Sanders recently equated the City of Baltimore to a THIRD WORLD COUNTRY," referring to remarks the senator made in 2015 after touring Baltimore following riots over the death of Freddie Gray, an African American man who died in police custody.

"Based on that statement, I assume that Bernie must now be labeled a Racist, just as a Republican would if he used that term and standard!" Trump tweeted.

Sanders made the comments about Baltimore in December 2015, when he was in the midst of his first presidential run.

"Anyone who took the walk that we took around this neighborhood would not think you're in a wealthy nation," Sanders told reporters at the Freddie Gray Empowerment Center, according to The Baltimore Sun. "You would think that you were in a Third World country."

Trump's comments about Sanders came after he previously attacked Baltimore and Rep. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) in tweets.

The president's tweets describing the city as "disgusting" and "rodent infested" were widely denounced as racist by Democrats, including Sanders, though the president has denied they were racist.

Sanders called Trump's tweets "unbelievable" Sunday on CNN's "State of the Union."