Israeli Prime Minister Benjamin Netanyahu on Sunday vowed to oppose any attempt to establish a Palestinian state, a day before the U.N. Security Council is to vote on an American resolution that leaves the door open to Palestinian independence.

Netanyahu has long ruled out a Palestinian state. But as the U.S. attempts to push forward with its Gaza ceasefire proposal, the Israeli leader faces international pressure to show flexibility.

The U.N. Security Council is expected to vote Monday on a U.S. proposal for a U.N. mandate for an international stabilization force in Gaza despite opposition from Russia, China, and some Arab countries.

The U.S., under international pressure from countries expected to contribute troops to the force, revised the resolution with stronger language about Palestinian self-determination. It now says Trump's plan may create a "credible pathway" to Palestinian statehood.

A rival Russian proposal uses even stronger language in favor of Palestinian statehood.

Netanyahu's hard-line governing partners have urged him to take a tough stand about the calls for Palestinian independence. Speaking to his Cabinet, Netanyahu said Sunday that Israel's opposition to a Palestinian state has "not changed one bit."

Netanyahu added that he has been staving off any advances toward a Palestinian state for decades and is not threatened by external or internal pressure.

"I do not need affirmations, tweets, or lectures from anyone," he said.

Netanyahu also noted that Trump's plan calls for Gaza to be demilitarized and Hamas to be disarmed.

"Either this will happen the easy way or it will happen the hard way," he said.

The Israeli leader also made his first public comments about a surge in violent attacks by Jewish settlers in the occupied West Bank, saying the violence was the work of a small minority.

Palestinians and human rights groups say the violence has been widespread and accused the government of turning a blind eye.

Violence has been rising in the West Bank, where Palestinian health officials said Sunday a 19-year-old Palestinian man was killed by Israeli military fire.

He was the seventh person to be killed in the West Bank in the past two weeks by Israeli fire. The spike in violence has been accompanied by a surge in settler attacks.

The Israeli military said it was operating in Nablus, in the northern West Bank, Sunday morning when the man hurled an explosive device at the soldiers, who fired in response and killed him.

In addition to Sunday's clashes, the Palestinian Health Ministry in the West Bank said six teenagers — ages 15 to 17 — were shot and killed by Israeli fire in four separate incidents over the last two weeks.

On Sunday, Netanyahu cast settler violence as the work of a few extremists. But Palestinians and rights groups say that the settler violence is widespread and carried out by settlers with impunity from Israel's conservative government.

Settler leaders and their allies hold top positions in Netanyahu's government, including the Cabinet ministers who oversee the national police force and West Bank settlement policies.

U.S. Secretary of State Marco Rubio said last week that there's concern that the events in the West Bank "could undermine what we're doing in Gaza."

U.N. Human Rights Commissioner spokesperson Thameen Al-Kheetan said the U.N. recorded more than 260 attacks by Israeli settlers against Palestinians and their property in the West Bank in October, more than in any month since 2006.