Tourists entering Gibraltar will require permission from Spanish authorities as Sir Keir Starmer has reached an agreement that transfers border control of the overseas territory to the EU.
Talks with the EU around Gibraltar's border concluded last week after more than four years.
Negotiations initially began in October 2021 under the previous Conservative Government.
Under the deal, Britons entering Gibraltar will be required to present their passports twice as part of a new dual-entry arrangement - first to a Gibraltarian and then to a Spanish guard, The Telegraph reports.
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Former Conservative leader Sir Iain Duncan Smith accused Sir Keir of seeking to "undo Brexit" over the plans.
The Chingford and Woodford Green MP told The Telegraph: "This deal on Gibraltar is a ridiculous disaster and a very good example of cowardly posturing by him in the hope that he will get closer relationships with Europe.
"They’re using Gibraltar as a lever to get themselves back closer to Europe. He wants to undo Brexit."
Negotiators from the UK, EU, Gibraltar and Spain finalised the legal text for the deal following a breakthrough on December 12, after an agreement was announced in June.
Sir Keir has been accused of seeking to 'undo Brexit'
|GETTY
A European Commission spokesman said: "The main objective of the future agreement is to secure the future prosperity of the whole region.
"This will be done by removing all physical barriers to the movement of persons and goods between Spain and Gibraltar, while preserving the Schengen area, the EU single market and customs union."
A spokesman for the Gibraltar Government added: "The process has now moved to the necessary technical legal scrub/reviews by all parties and the EU translation process.
"We remain committed to transparency: the final treaty will be made public and subject to the full scrutiny of the Gibraltar, UK and EU parliaments as part of the process of ratification."
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It is understood tourists travelling to Gibraltar will need to present their passports twice as part of a new 'dual' border system
| GETTYThe Government said in June the agreement resolves the "last major unresolved issue from Brexit".
Gibraltar is located on the southern tip of the Iberian Peninsula which was formally ceded to Britain from Spain in 1713.
Under the terms of the deal, there will be a "fluid border" between Spain and Gibraltar, aimed at avoiding "onerous checks" and long delays at the border.
Around 15,000 people cross the border between Spain and the overseas territory every day.
Immigration and law and order in Gibraltar will remain the exclusive responsibility of its authorities, while Spanish officials will be responsible for ensuring the integrity of the Schengen Area, with which Gibraltar shares a border.
The Government said the deal includes a "clause agreed by all sides which makes explicitly clear that the final Treaty does not impact sovereignty".
Labour has this week been accused of "betraying Brexit" after announcing the UK will rejoin the EU's Erasmus student exchange scheme.
The UK left the scheme under Boris Johnson, who argued it did not offer value for money.
The Government said it will pay around £570million to rejoin the scheme in 2027, with the cost for future years to be agreed with the bloc, which No10 insisted is a "good deal".
Tory shadow foreign secretary Dame Priti Patel accused ministers of "throwing away billions of pounds of hard-pressed taxpayers’ money on rejoining Erasmus" as they "continue to betray Brexit".
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