US comedian Kathy Griffin has lashed out at Samantha Armytage, telling the Sunrise host she was "full of crap" for attempting to justify the backlash to Griffin's controversial Donald Trump beheading stunt.

The comedian, who announced an upcoming tour of Australia on Monday, was widely condemned in June after appearing in a video clutching a fake, bloodied, severed head of Trump.

The public fallout saw the comedian being fired from a regular gig on CNN, losing sponsorship deals, and even being personally called out by Trump, who said the stunt had traumatised his son Barron.

Armytage appeared to play devil's advocate during the interview on Sunrise on Tuesday morning, saying the fact that Griffin's liberal friends – including Chelsea Clinton and Will & Grace star Debra Messing – had slammed the stunt was proof she'd gone too far.