Vermont Sen. Bernie Sanders shot back at former Maryland Gov. Martin O'Malley during Saturday's Democratic debate, telling him that he shouldn't be lecturing him on guns given the gun violence issues currently plaguing Baltimore.

O'Malley, a former mayor of Baltimore, was criticizing Sanders' record on gun control. "With all due respect, I think it's fair to say that Baltimore is not now one of the safest cities in America," Sanders told O'Malley.

The attack came after O'Malley touted his role in passing comprehensive gun control and went after the Vermont socialist for his 2005 vote for the Protection of Lawful Commerce in Arms (PLCCA) Act to give "immunity" to gun dealers.

Sanders comment comes the exact same day in which Baltimore incurred its 300th homicide of the year, the most since 1999.

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