British sovereignty over Gibraltar remains "sacrosanct", the foreign secretary has said, after the UK agreed a deal with the European Union over the territory's post-Brexit future.
David Lammy told the House of Commons the agreement included a clause "explicitly protecting our sovereignty".
The deal removes checks on people and goods crossing the Gibraltar-Spain border.
However, some MPs raised concerns Spanish border officials would be able to deny entry to UK citizens flying into the British Overseas Territory.
For travellers arriving at Gibraltar airport, passport checks will be carried out by both Gibraltarian and Spanish officials.
This is similar to the system in place for Eurostar passengers at London's St Pancras station, where travellers pass through both British and French passport control before boarding international trains.
This means it will be possible for arrivals to continue their travel from Gibraltar into Spain and the rest of the EU without further checks.
But Lammy insisted Gibraltar would not be joining the Schengen free travel area – 26 European states that have abolished passport control at their mutual border so people can travel freely.
Schengen countries also have common rules on asylum and countries whose nationals require visas.
Lammy said it was "fake news" that Gibraltar would be joining Schengen and "this was never on the table".
"Immigration, policing and justice in Gibraltar will remain the responsibilities of Gibraltar's authorities," he added.
