Israeli Prime Minister Benjamin Netanyahu has had emergency surgery to fit a pacemaker, after being taken to hospital on Saturday night.

Doctors at Sheba Medical Centre said the procedure went well and he is not in a life-threatening condition.

Mr Netanyahu’s hospitalisation comes ahead of a key vote in parliament on a contentious overhaul of the judiciary.

Protests against the reform have swept Israel, with many workers vowing to strike if the bill goes ahead.

In a video address ahead of the overnight surgery, Mr Netanyahu said he was feeling “excellent” but listening to his doctors.

There had been growing questions over his health after he was admitted to hospital last week supposedly suffering from dehydration.

The operation went smoothly “without any complications,” Professor Roy Beinart from the Sheba Medical Center said, adding that Mr Netanyahu “is not in a life-threatening condition”.

His office said Mr Netanyahu was expected to be discharged later on Sunday, but trips planned to Cyprus and Turkey would be rescheduled.

Mr Netanyahu said he should be well enough to attend parliament after the procedure. The next 48 hours are expected to see a critical vote on his government’s plans for changes to the judiciary. There have been months of protests in Israel over the reforms, which seek to limit the Supreme Court’s powers.

The vote – expected to take place on Monday – will amount to a showdown between the hard-line religious-nationalist coalition and swathes of Israeli society.

The last few days have seen tens of thousands of protesters march from Tel Aviv to Jerusalem to oppose the justice system changes, with people filling the main highway.

Many protesters camped up at Sacher Park in Jerusalem, near the parliament, after the four-day protest march.

Demonstrations near the parliament are expected, and the coalition also faces the threat of a mass boycott of service duty by thousands of military reservists, including hundreds of air force pilots, if the law passes.

Three former army chiefs of staff and dozens of senior Israeli security officials signed a letter on Saturday criticising the government’s judicial reform plans and supporting reservists.

“This legislation is destroying the common foundations of Israeli society, ripping the people apart, dismantling the army and inflicting fatal harm to Israel’s security,” the letter reads.

Brothers in Arms, which represents 10,000 reservists, have voiced their frustration at the government’s plans.

“We’ve tried everything, this is where we draw the line,” Eyal Nave, one of the leaders of Brothers in Arms, said.

“We pledged to serve the kingdom and not the king,” Mr Nave said. Appealing directly to Mr Netanyahu, he said: “You and only you are responsible for what is happening here. We had faith in the government but the government broke us.

“I will not volunteer to serve in a dictatorial state,” Mr Nave added.

A boycott by such a large number would seriously impact the operational capability of the Israeli military and so this is being seen as one of the most pivotal moments in the anti-government protest movement so far.

Israel’s Supreme Court is the only source of scrutiny on the government’s use of its power.

Mr Netanyahu’s critics worry the reform will severely undermine Israel’s democracy by weakening the judicial system.

Supporters of the reforms argue that the Supreme Court has become increasingly “activist” over the decades, hindering the policies of democratically elected governments. They accuse judges of making politically-based decisions.

But many worry the prime minister – who currently faces corruption charges, which he denies – is trying to use the judicial reform to thwart his own legal issues.

Mr Netanyahu vehemently denies such accusations.