Spain may be aware of a secret US plan to attack Iran. That could be the reason why they decided to pull out Spanish frigate Méndez Núñez from the naval attack group accompanying the USS Abraham Lincoln aircraft carrier in the Persian Gulf.
No evidence is provided to support this claim.
Actually, the Spanish government explained very clearly that the reason why they decided to order the Méndez Núñez frigate to leave the group was because it changed its stated original mission. Spain’s acting defence minister, Margarita Robles, said that the decision is technical and military, not political, and that the frigate will rejoin the fleet once it reaches the Indian Ocean, according to Spanish newspaper El País.