Netanyahu spoke two days after Israel's key ally the United States and many Muslim-majority nations endorsed a draft UN resolution backing President Donald Trump's Gaza peace plan, saying the process offered a route to Palestinian statehood.
The 15-member UN Security Council began negotiations on November 7 on the draft, which would mandate Trump's proposal for a "Board of Peace" transitional administration in Gaza to address issues including post-war reconstruction and economic recovery.
Trump's 20-point plan includes a clause saying that if there were reforms within the Palestinian Authority, "the conditions may finally be in place for a credible pathway to Palestinian self-determination and statehood, which we recognise as the aspiration of the Palestinian people".
That point infuriated Israeli far-right leaders who had opposed the Trump-brokered October ceasefire in Gaza, testing Netanyahu's awkward governing coalition of conservatives and ultra-nationalists.
On Saturday far-right ministers Itamar Ben-Gvir and Bezalel Smotrich called on Netanyahu to denounce the idea of a Palestinian state. Ben-Gvir threatened to leave the governing coalition if the prime minister did not act.
Netanyahu said in a statement on Sunday: "Our opposition to a Palestinian state in any territory has not changed. Gaza will be demilitarised and Hamas will be disarmed, the easy way or the hard way. I do not need affirmations, tweets or lectures from anyone."
A far-right walkout could bring down Netanyahu's right-wing government well before the next election, which must be held by October 2026.
Israeli Defence Minister Israel Katz and Foreign Minister Gideon Saar also issued statements on X against a Palestinian state on Sunday, without mentioning Netanyahu.
Trump's Gaza plan ended major fighting between Israel and Palestinian militant group Hamas after two years of war that devastated the Palestinian enclave and triggered spillover conflicts across the Middle East.
Netanyahu embraced Trump's plan during a visit to the White House in September but until Sunday had made no new statement on the Palestinian statehood issue.
Ahead of his White House visit, Netanyahu said he would respond to a number of major Western nations including France that formally recognised a Palestinian state in September, angering Israel, but has not followed up with any diplomatic actions.
Smotrich had on Saturday accused Netanyahu of failing to live up to his promise and called on him to formulate a response immediately: "Two months have passed in which you have chosen silence and political disgrace."
He urged Netanyahu to "make clear to the entire world (that)a Palestinian state will never arise on the lands of our homeland."
Two years of intense Israeli bombardment and ground offensives in the Gaza Strip killed more than 69,000 people, according to local health authorities. The war was touched off by Hamas' cross-border attack on Israel on October 7, 2023 that killed around 1200 people, according to Israeli tallies.
The ceasefire came into effect on October 10 although there have been repeated, though scattered, outbreaks of violence since then.
