Tenacious D's remaining Australian concerts cancelled amid Trump ...

Jack Black says he no longer feels it is "appropriate" to continue Tenacious D's tour following a controversial joke at the band's Sydney show on the weekend.

Black's bandmate Kyle Gass joked about the shooting of former president Donald Trump, which Black says he does not condone.

The band were scheduled to play Melbourne, Brisbane and Adelaide shows over the next week.

Jack Black, one half of the American comedy rock duo Tenacious D, says he no longer feels it is "appropriate" to continue the band's tour following a controversial joke by his bandmate Kyle Gass at the band's recent Sydney show.

"I was blindsided by what was said at the show on Sunday," Black wrote in a statement posted on Instagram.

"I 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 added he was grateful to the band's fans for their "support and understanding".

Tenacious D's Australian visit took a turn this week after video emerged of Gass making a controversial joke on stage at the second show of their tour.

At Sydney's ICC Theatre on Sunday night, Gass said, "Don't miss Trump next time" when Black asked if he had a birthday wish.

Gass's comment was made in relation to the attempted assassination of former US president Donald Trump in Butler, Pennsylvania over the weekend.

The band earlier postponed Tuesday night's concert at the Newcastle Entertainment Centre just hours before doors were due to open, with no reason given for the cancellation at the time.

"Frontier Touring regret to advise that Tenacious D's concert tonight at Newcastle Entertainment Centre has been postponed," the tour promoters posted on Instagram this afternoon.

"Ticket holders are asked to hold onto their tickets until further information is available."

Some fans were reportedly already lining up at the venue when staff informed them the show would not be going ahead.

The joke has attracted a great amount of attention from international media as well as here in Australia.

Senator Ralph Babet today called for the band to be deported from Australia immediately.

"I call on the Prime Minister Anthony Albanese to join me in denouncing Tenacious D, Jack Black, and band member Kyle Gass, and I call on the Immigration Minister Andrew Giles to revoke their visas and deport them immediately," Senator Babet's statement reads.

"Anything less than a deportation is an endorsement of the shooting and the attempted assassination of Donald J. Trump."

The sold-out arena tour is Tenacious D's first Australian visit in over a decade.

The band were set to play concerts in Brisbane, Melbourne and Adelaide over the coming six days.