An impending crisis over conscripting ultra-Orthodox Jews into the Israeli army is threatening to undermine Israel's government and split the country.

Public opinion on the issue has shifted dramatically in Israel after two years of war, and this is now perhaps the most explosive political risk facing Prime Minister Benjamin Netanyahu.

Lawmakers are currently considering a draft bill to end the exemption granted to ultra-Orthodox men enrolled in full-time religious study, established when the State of Israel was declared in 1948.

That exemption was ruled illegal by Israel's High Court of Justice almost 20 years ago. Temporary arrangements to continue it were formally ended by the court last year, forcing the government to begin drafting the community.

Some 24,000 draft notices were issued last year, but only around 1,200 ultra-Orthodox - or Haredi - draftees reported for duty, according to military testimony given to lawmakers.

Tensions are erupting onto the streets, with lawmakers now debating a new draft bill to force ultra-Orthodox men into military service alongside other Israeli Jews.

Two Haredi politicians were targeted this month by some extreme ultra-Orthodox protesters, who are furious with parliament's discussion of the proposed law.

And last week, a special Border Police unit had to rescue Military Police officers who were targeted by a large crowd of Haredi men as they tried to arrest a suspected draft-evader.

The push to conscript more ultra-Orthodox also triggered a vast protest by tens of thousands of Haredi men in Jerusalem last month - with the issue seen by many as part of a wider conflict around the identity of the Jewish state, and the place of religion within it.

Opinion polls suggest support for ultra-Orthodox conscription is rising. A survey in July by the Israel Democracy Institute think tank found that 85% of non-Haredi Jews - including almost three-quarters in Netanyahu's own right-wing Likud party - supported sanctions for those who refused a draft order.

Ultra-Orthodox parties are crucial allies in Netanyahu's governing coalition, and demands for continued exemption for their supporters from the military draft may affect the stability of his government.

As changes loom within Israel, the ultra-Orthodox community is navigating the tension between traditional values and pressures from modern Israeli society.