Can EU States Block Brexit deal?

According to Reuters, the Spanish prime minister’s threats to block a Brexit deal this week over Madrid’s claims to Britain’s tiny territory of Gibraltar on the Spanish coast has raised questions of veto risks for the package.
The European Council of the 27 national leaders is due to give its political endorsement at a Brussels summit on Sunday at 10 a.m. (0900 GMT) before holding a meeting with May to demonstrate the commitment of both sides.