Stephen Flynn accused Rishi Sunak of calling Scottish independence supporters an "extremist threat" to UK security.
The SNP leader alluded to a comparison the prime minister made of North Korea and Iran with those who support Scottish independence.
The prime minister retorted saying that Mr Flynn's party was a "threat to the United Kingdom".
Watch more on Independent TV: www.independent.co.uk/tv/edit...
Click here to subscribe to The Independent: bit.ly/Subscribe-to-Independent
About The Independent:
Making Change Happen. The Independent is the world’s most free-thinking newsbrand, providing global news, commentary and analysis for the independently-minded.
Connect with The Independent:
Check out our full video catalog: / theindependent
Videos, daily editorial and more: www.theindy.com
Click here to get the best of The Independent daily: www.independent.co.uk/newslet...
Like The Independent on Facebook: www. TheIndependentOnline
Follow The Independent on Twitter: / independent
Follow The Independent on Instagram: / the.independent
Download the iOS & Android app: www.independent.co.uk/subscri...
Help to support truly independent journalism. Every dollar you contribute will directly fund additional special reports and investigations from a free-thinking, award-winning newsroom you can trust - www.independent.co.uk/donations
Subscribe to Independent Premium for exclusive content & live events: bit.ly/2MiOONB