Democratic vice presidential candidate Tim Kaine mocked Donald Trump Thursday for saying the former Virginia governor was the governor of New Jersey

“If you don’t know like there’s 50 states and New Jersey and Virginia are different and you know you’re trying to run for president and learn that on the fly, lord help you,” Kaine said in an interview with ABC’s David Muir.

The Virginia senator was referring to Trump’s remarks in a speech Wednesday when Trump said “her running mate Tim Kaine, who by the way did a terrible job in New Jersey — first act he did in New Jersey was ask for a $4 billion tax increase and he was not very popular in New Jersey and he still isn’t.”

“He actually said about me in the news conference that I was a lousy governor of New Jersey…I’m a governor of Virginia,” Kaine added.

Tim Kaine was governor of Virginia from 2006 to 2010 and then was elected as a U.S. senator from Virginia in 2012.

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