Biden: I 'would've thrown my body in front of' my son to keep him from military service under Trump

Vice President Joe Biden said on Monday he would have stopped his son from serving in the military if Donald Trump were president and controlled deployments.

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Appearing at a campaign event alongside Hillary Clinton, Biden praised his son, former Delaware Attorney General Beau Biden, for serving in Iraq but noted that he would have kept his son from serving if Trump dictated US foreign policy.

"If Donald Trump had been president, I would've thrown my body in front of him to keep him from going if the judgment was based on Donald Trump's decision," Biden said of his son, who died in May 2015 after a prolonged battle with cancer.

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After reiterating his criticism of Trump's appeal to middle-class voters, the vice president questioned Trump's foreign-policy proposals and credentials. Biden criticized Trump's positive statements about Russian President Vladimir Putin and his advocacy for non-nuclear powers like Japan to acquire their own nuclear weapons.

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"There's a guy who follows me back there who has the nuclear codes if, God forbid, something happens to the president," Biden said. "[Trump] is not qualified to know the code. He cannot be trusted."

He added: "Don't cheer; just listen. No candidate has known less or been less prepared than Donald Trump. What absolutely amazes me is he doesn't seem to want to learn it."

Biden heaped praise on Clinton, touting their shared working-class roots and invoking the significance Clinton's presidency would have for women and girls seeking higher office. The vice president also ruminated on his family's past financial struggles and the value of resilience in the face of economic hardship.

The speech came minutes before Trump delivered what his campaign has billed as a major address on his ideas for national security and foreign policy. Trump reiterated his plan to increase scrutiny of immigrants and end what the campaign characterized as US "nation-building" abroad.