A high court judge blocked the injunction approved by the British government in the early hours of Thursday to reach its deal to hand over the Chagos Islands.
Ministers will grant Green Light agree to Mauritius on Thursday the sovereignty of the Muzo Islands.
Downing Street objection reportedly announced the deal was about the prospect of a political rebound, which would join the Prime Minister in a virtual event with the Mauritius government.
But Judge Goose granted Bertice Pompe "interim relief" in the ban granted at 2.25 a.m. Thursday, in the ban proposed by the Foreign Ministry.
Born in Diego Garcia, the largest island in the Chagos Archipelago, Pompe has taken legal action against the agreement.
Goose said in his order: "The defendant shall not take any conclusive or legally binding steps to end his negotiations regarding the possible transfer of British Indian Ocean territory (also known as the Chagos Islands) to foreign governments or to bind specific terms of any such transfer."
A hearing is expected to be held at 10:30 a.m. Thursday.
Under the agreement, the UK will control the islands to Mauritius, but lease Diego Garcia for 99 years to continue operating a joint U.S. military base there. Ministers refused to disclose the rental costs, but reportedly around £90 million a year.
A government spokesman said: "We do not comment on ongoing legal cases. This deal is a suitable matter to protect the security of the British people and our national security."
No. 10 Donald Trump signed the deal last month after meeting with Keir Starmer at the White House in February, where the U.S. president said he "feels that it will work well."
Some governments and within Labor have attacked the deal, asking why Britain spent billions of dollars under cost pressure.
Downing Street is said to have been worried about the strong opposition of “toxicity”, announced amid a huge shock over the cuts in winter fuel payments and disability benefits.
Members of MPs and campaigners say the cuts have caused a huge loss of labor in local elections in England earlier this month.
The news that the government intends to green light comes the day after Starmer announced a turnaround on winter fuel allowances. He told the Commons Wednesday that he wanted to "make sure we move forward and more pensioners are eligible for winter fuel payments". The Guardian revealed earlier this month that Downing Street is reconsidering the policy.
Until February, the administration had been concerned that Trump would block the Chagos Islands deal after sparking backlash from Conservatives and senior U.S. Republicans.
Senior figures in the Trump administration include Secretary of State Marco Rubio, who criticized the proposals because of Mauritius' relations with China.
British reform leader Nigel Farage repeatedly claimed that Trump would reject the proposal once he turned his attention to it, but that didn't happen.