Railing against “tax breaks for billionaires” and issuing a warning to Pennsylvania lawmakers, Sen. Bernie Sanders delivered a firebrand speech Thursday afternoon to a crowd clustered outside City Hall.

A massive crowd gathered at City Hall in Philadelphia Thursday for a May Day rally and to see Vermont Sen. Bernie Sanders speak. The "For Workers, Not Billionaires" rally on the north side of City Hall drew a large crowd and shut down streets in the area.

Thursday’s rally and march comes amid economic uncertainty created by Trump’s on-again, off-again approach to tariffs — taxes on imported goods — which