Supreme Court proposals would let presiding judges "clarify" questions during deliberations and cut jury panels from six or eight members to four — changes lawyers say undermine a system that acquits at 60 times the national average in non-jury trials.
Saudi and UAE authorities have said little publicly beyond confirming that investigations were underway. Israeli Prime Minister Benjamin Netanyahu has said the copilot was arrested.
The measures come as the country's conservative leader Sanae Takaichi looks to deliver on election promises spearheaded by vast immigration reforms, following her historic supermajority election victory in February.
The US-led force has been operating in Iraq for 12 years to dismantle ISIS networks which had threatened to take over the region and plunge it into instability.