Jack Black axes tour after bandmate's Trump comments

American comedy-rock duo Tenacious D, formed by actors Jack Black and Kyle Gass, suspended the rest of its Australian tour after comments made by Gass over the assassination attempt on former US President Donald Trump.

A video widely shared on social media from the concert in Sydney showed Gass being presented with a birthday cake and Black urging him to make a wish. Gass then seemed to say, "don't miss Trump next time" before blowing out the candles.

Trump was shot in the ear during a campaign rally in Pennsylvania on Saturday, which the FBI is probing as an assassination attempt. The former president has since attended the Republican National Convention with a thick bandage over his right ear.

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On Tuesday Gass apologised on Instagram for his, "severe lack of judgment" and said the comments were inappropriate, dangerous and a terrible mistake. Black said he was "blindsided" by the comments and that he would never condone hate speech or encourage political violence in any form.

"After much reflection, I no longer feel it is appropriate to continue the Tenacious D tour, and all future creative plans are on hold," Black said.

Black, who has starred in School of Rock, The Holiday and Jumanji and was the leading voice role in the Kung Fu Panda animated movies, has been a vocal supporter of Joe Biden and had attended a re-election fundraiser event for him in June.