Story highlights Tim Kaine slammed Donald Trump for not releasing his tax returns

The Democratic vice presidential nominee raised a series of questions about the GOP standard-bearer

Manchester, New Hampshire (CNN) Tim Kaine took aim at Donald Trump Saturday, slamming the Republican nominee for not releasing his tax returns.

"Every president since Richard Nixon, and including Nixon. Now he was not known for the most elevated ethical standards," said Kaine, the Democratic vice presidential nominee, at a Manchester, New Hampshire, campaign organizing event.

"But I will say, even Richard Nixon released his tax returns to the public when he was running for president. Because, he said -- as has every major party nominee of both parties since -- the American public have a right to see my tax returns."

Trump, however, "is not doing it."

"He says the rules that apply to everybody else do not apply to Donald J. Trump," the Virginia senator said.

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