He was sacked as Trump’s national security advisor in spectacular fashion in 2019, but foreign policy hawk John Bolton hasn't let that stop him from weighing in on US politics.

As Kamala Harris closes the gap with Donald Trump, we asked Bolton if the Vice President has the political heft to lead the United States when global security is facing its greatest threats in decades.

Plus: why Trump isn’t “fit to be president”, what he makes of the Republican VP pick JD Vance, and how he’ll be voting come November.

Producers: Lilian Fawcett and Georgia Coan

Senior Producer: John Cadigan

Planning Editor: Venetia Rainey

Executive Producer: Louisa Wells

Studio Operator: Meghan Searle

Video Editor: Luke Goodsall

Social Media Producer: Niamh Walsh

Original music by Goss Studio

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John Bolton: Why his old boss Trump 'isn't fit to be president'