U.K. Prime Minister Sir Keir Starmer was battling to save his position Monday, refusing to step aside despite mounting pressure from within his own party and a wave of resignations among close aides.

Resignation calls intensified after more than 70 Labor MPs publicly urged the Labor leader to quit, while several parliamentary aides stepped down in protest, according to reports.

The growing rebellion comes at a critical moment for Starmer, whose authority has been shaken by political and economic setbacks.

As previously reported by Fox News Digital, the immediate trigger was the crushing defeats in local election results on May 8, which saw Labor lose hundreds of council seats across England, surrender long-held ground in Wales and fall behind rivals in Scotland.

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A recent YouGov poll also found that around half of Britons believe Starmer should step down.

At the same time, rising U.K. borrowing costs have added to concerns about the government’s economic and public service policies and not easing living costs.

Starmer was also hurt by his decision to appoint Peter Mandelson, a friend of Jeffrey Epstein, as Britain’s ambassador to Washington, the Associated Press reported.

In Scotland, Labor's difficulties were laid bare as John Swinney secured a decisive victory, dealing a further blow to Starmer’s authority.

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The result drew attention from President Donald Trump, who publicly congratulated Swinney and appeared to take a swipe at Starmer.

Trump and Starmer’s relationship had become strained, with the president saying, "This is not Winston Churchill that we’re dealing with," blasting the U.K. leader’s reluctance to let U.S. warplanes use its bases after the start of the war against Iran.

Meanwhile, Starmer struck a defiant tone in what has been termed a "reset" speech on Monday, insisting he would not resign.

"I take responsibility for not walking away, not plunging our country into chaos, as the Tories did," he said.

Sam Carlin, one of the MPs calling for change, said Starmer was "not the right person" to revive the struggling party.

"As a result, I join Labor colleagues from across the United Kingdom in urging the prime minister to step down for the sake of our movement and the people we serve," he said.

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"We have made so much progress, but if we remain on our current course, it will not last."

Former minister Catherine West led efforts to formalize the challenge, calling for a timetable to elect a new leader as early as September.

Three figures are seen as frontrunners to succeed Starmer.

Greater Manchester Mayor Andy Burnham would need to return to Parliament to mount a bid, while Angela Rayner continues to contend with the fallout from past tax issues.

Health Secretary Wes Streeting is viewed as a more immediate contender.

Under Labor rules, a leadership contest can be triggered if sufficient backing coalesces behind a challenger, typically through nominations from MPs and affiliated groups.

If Starmer were to resign, the party would move into a formal contest period, culminating in a vote among members.

A second suspected oil slick has been detected near Iran’s Kharg Island export hub, according to maritime intelligence firm Windward AI, heightening fears of an environmental disaster as a larger spill identified May 8 continues drifting toward Saudi Arabian waters.

The suspected new slick comes as U.N. officials warned Sunday that oil spills in the region could trigger an environmental catastrophe amid the ongoing Strait of Hormuz crisis.

"Another possible oil spill was detected today at 11 a.m. local time," Windward told Fox News Digital. The approximate visible area, according to the firm, was between 12 to 20 square kilometers.

Tehran has pointed to foreign vessels, but maritime experts say the main slick — estimated at tens of thousands of barrels and covering about 65 square kilometers, according to the U.N. University Institute for Water, Environment and Health — is more likely linked to aging infrastructure, pipeline ruptures or a "war mode" environment that has threatened the waterway since February.

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"We should worry about the cause of the slick and monitor things carefully to see if there are new developments," U.N. official Dr. Kaveh Madani told Fox News Digital.

"If this slick gets bigger, we should be seriously worried about there being a leakage of aging infrastructure," Madani said, adding the slick was "moving away toward the southwest of the island."

"We just have to see how it moves and if it gets closer to the centers of population. If it does, desalination operations also must be halted. The risk is low right now," he said.

Madani also noted the slick is near a zone with a heavy concentration of pipelines and energy infrastructure.

"Keeping these infrastructure systems healthy and operational has been very hard for the Iranians even in peacetime due to sanctions," he said, warning that amid conflict, a "major accident is very likely."

Water circulation in the Persian Gulf is slow, meaning pollution can persist for extended periods, he added.

"We saw similar instances during the Gulf wars and the Iran-Iraq War, with these things impacting coastal communities, the fishing industry, marine life and even the intake of desalination plants," he said.

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The larger spill, visible in satellite images as a gray-and-white slick, was first detected west of Kharg Island, Windward AI reported May 8, and has been steadily moving.

"It is believed to be crude rather than bunker fuel and unlikely to have come from a ship, possibly originating from pipeline issues or a failed ship-to-ship transfer," the firm said.

The spill could pass through Qatar’s exclusive economic zone within about four days, with possible landfall near Al Mirfa in the United Arab Emirates in roughly 13 days, according to Windward.

The incident comes as Washington ramps up "Economic Fury," tightening sanctions and increasing its naval presence near the Strait of Hormuz to curb Iran’s oil exports.

Since Iran closed the strait in late February following the outbreak of hostilities, tankers have bottlenecked across the region as the vital oil chokepoint remains largely shut.

"We also know that there are many tankers in the area, so there is a chance of an accidental spill," Madani said.

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"As long as the closure of the Strait of Hormuz is there and the region is in a war mode, the environment would not be a priority, but monitoring the behavior of tankers would not be trivial," he said.

Meanwhile, Jafar Pourkabgani, a lawmaker representing Bushehr province, claimed the slick was caused by "oil residue and ballast water waste from European tankers" discharged into the sea.

"This claim is false and part of the enemy’s psychological operation," he wrote on X, referring to allegations Iran released oil due to full storage tanks.

Iran’s Oil Terminals Company also denied reports of a leak near Kharg Island, according to Reuters.

The company’s chief executive said Sunday that inspections found no evidence of leaks from storage tanks, pipelines, loading facilities or nearby tankers.