Police are desperate to find those who carried out the attack at the Westgate Bowling Alley last month.
Adelaide news site The Advertiser reports Maraku "laughed while taking selfies" after his sentencing over the November attack.
CCTV footage shows the men forcibly entering the Mt Roskill store, before fleeing with a large amount of jewellery.
"You can stop the guns from getting into these children's hands," a devastated Lori Alhadeff told Trump, via CNN.
Seventeen people are dead and a former student of the school is in custody over the massacre.