In a blow to the Obama administration's labor-law plans, a federal court has blocked the start of a rule that would have made an estimated 4 million more American workers eligible for overtime pay heading into the holiday season.

As a result of Tuesday's ruling, overtime changes set to take effect Dec. 1 are now unlikely be in play before vast power shifts to a Donald Trump administration, which has spoken out against Obama-backed government regulation and generally aligns with the business groups that stridently opposed the overtime rule.

The U.S. District Court in the Eastern District of Texas granted the nationwide preliminary injunction, saying the Department of Labor's rule exceeds the authority the agency was delegated by Congress.

"Businesses and state and local governments across the country can breathe a sigh of relief now that this rule has been halted," said Nevada Attorney General Adam Laxalt, who led the coalition of 21 states and governors fighting the rule and has been a frequent critic of what he characterized as Obama administration overreach. "Today's preliminary injunction reinforces the importance of the rule of law and constitutional government."

The regulation sought to shrink the so-called "white collar exemption" that allows employers to skip overtime pay for salaried administrative or professional workers who make more than about $23,660 per year. Critics say it's wrong that some retail and restaurant chains pay low-level managers as little as $25,000 a year and no overtime — even if they work 60 hours a week.

Britain's Supreme Court began hearing a landmark case Monday that will decide who has the power to trigger the U.K.'s exit from the European Union — the government or Parliament.

The legal battle has major constitutional implications for the balance of power between the legislature and the executive, and has inflamed Britain's already raw wound over how and whether to leave the EU.

The court's most senior justice, David Neuberger, opened the four-day hearing by condemning the "threats of serious violence and unpleasant abuse" directed at Gina Miller, one of the claimants trying to ensure Parliament gets a say.

"Threatening and abusing people because they are exercising their fundamental right to go to court undermines the rule of law," Neuberger said, banning publication of the addresses of Miller and other parties in the case.

Neuberger and 10 other justices at the country's top court must decide whether Prime Minister Theresa May's government can invoke Article 50 of the EU's key treaty, the trigger for two years of divorce talks, without the approval of lawmakers.

May plans to trigger Article 50 by the end of March, using centuries-old government powers known as royal prerogative. The powers — traditionally held by the monarch but now used by politicians — enable decisions about joining or leaving international treaties to be made without a parliamentary vote.

Financial entrepreneur Miller and another claimant, hairdresser Deir Dos Santos, went to court to argue that leaving the EU would remove some of their rights, including free movement within the bloc, and that shouldn't be done without Parliament's approval.