Israel’s Supreme Court on Tuesday opened the first case to look at the legality of Prime Minister Benjamin Netanyahu’s contentious judicial overhaul — deepening a showdown with the far-right government that has bitterly divided the nation and put the country on the brink of a constitutional crisis.

In a sign of the case’s significance, all 15 of Israel’s Supreme Court justices are hearing appeals to the law together for the first time in Israel’s history. A regular panel is made up of three justices, though they sometimes sit on expanded panels. The proceedings were also being livestreamed.