US presidential debate: Biden says Trump is Russian President 'Putin's puppy'

Joe Biden and Donald Trump. Credit: Reuters

Democratic challenger Joe Biden on Tuesday accused Donald Trump of failing to confront Russia, accusing the US leader of being the "puppy" of Russian President Vladimir Putin.

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"I've gone head to head with Putin, and made it clear to him -- we're not going to take any of this stuff. He's Putin's puppy," Biden said of Trump.