Political newcomer Donald Trump does not believe lifelong politician Hillary Clinton is "presidential material" and he's encouraging voters to take a deep look into her email server scandal.

The GOP front-runner tweeted late Friday, "Hillary Clinton is a major national security risk. Not presidential material!"

His criticism of Clinton came hours after the State Department published 1,000 pages of Clinton's private emails, including 22 emails classified as "top secret." Clinton had told reporters in 2014 that although she used a private email server while serving as the top diplomat, she did not send any classified information.

Trump's tweet doubled down on an earlier one that had asked how "someone with such bad judgement [could] be our next president"?

Trump and Clinton have gone back and forth bashing each another on the campaign trail despite a well-documented working friendship while Clinton was a New York senator and Trump oversaw his global corporation based in Manhattan.