Prime Minister Tony Abbott has again called on the Indonesian president to show mercy to two Australian men facing the death penalty.

On the weekend Indonesia executed six convicted drug smugglers by firing squad — five of them foreign nationals.

Australians Myuran Sukumaran and Andrew Chan are facing the same fate over their role in the so-called Bali Nine drug smuggling ring.

Last week Mr Abbott renewed his written plea to Indonesian president Joko Widodo to accept requests for clemency on behalf of the pair.

He said this morning there was evidence the men were genuinely remorseful.

"My job is to try and stop the executions going ahead," Mr Abbott told the Australian Radio Network.

"I don't want to pre-empt what may or may not happen afterwards, but I think these two are well and truly reformed characters and I hope the Indonesians will accept that, acknowledge it.

"I hope that the evidence of genuine remorse, of genuine rehabilitation, means that even at this late stage pleas for clemency might be accepted.

"Because in the end, mercy has to be a part of every justice system, including the Indonesian one."

Bob Lawrence, father of Renae Lawrence, who is serving 20 years for her part in the Bali Nine drug ring, said the two men did not deserve the death penalty.

He said the Bali Nine were all young people who had made a silly mistake.

"Kids will do silly things, kids will do things to protect their families, kids will do things for a quick quid," he said.

"They think they're invincible, but they don't deserve the death penalty. It doesn't matter whether they organised it or what — a life sentence is bad enough.

"Possibly down the track, they might be old people when they get out, but hopefully they'll get out."

Yesterday Foreign Minister Julie Bishop made similar appeals but said her requests to Indonesia had been rebuffed.

A clemency appeal for Sukumaran has been denied and Chan's chances of reprieve appear equally doomed after Mr Widodo made it clear there was no prospect he would show mercy for prisoners on drug convictions.