​British Prime Minister Keir Starmer supports a FIFA investigation into Argentina’s players celebrating with a political banner on the field following the World Cup semifinal against England.The players held up a flag reading “Las Malvinas Son Argentinas,” or “The Falklands are Argentine,” referencing the country’s claim over an archipelago in the South Atlantic that exists as a British Oversees Territory. Argentina has long declared that the islands, 300 miles off its coast, belong to the country.AdvertisementAdvertisementAdvertisementA spokesman for the prime minister said in a statement that “the World Cup might not be ours, but the Falkland Islands definitely are.””Our position is unchanged. Self-determination rests with the islanders and our commitment to the Falklands will never waver,” the PM’s office said. “More broadly, potential action is a matter for FIFA, but it’s been a fantastic World Cup and we’ve said throughout that politics should stay out of football.”Argentina’s players hold the banner on the field after defeating England.Argentina’s military junta invaded the islands in 1982 and the British fleet traveled across the Atlantic to retake the territory, ending in a 74-day undeclared war that resulted in more than 900 casualties.AdvertisementAdvertisementAdvertisementAnticipating tensions around the game due to the conflict fought between the two countries, Argentina’s security minister Alejandra Monteoliva said before the match that flags and banners referencing sovereignty of the territory would not be allowed into the stadium in Atlanta.The International Football Association Board (IFAB) has specific rules against players participating in political messaging.”Equipment must not have any political, religious or personal slogans, statements or images. Players must not reveal undergarments that show political, religious, personal slogans, statements or images, or advertising other than the manufacturer’s logo,” IFAB’s rulebook states.AdvertisementAdvertisementAdvertisement”For any offense the player and/or the team will be sanctioned by the competition organizer, national football association or by FIFA.”The Argentina national team and players could face punishment, but it’s extremely unlikely that any sanction would impact Sunday’s World Cup final.This article originally appeared on USA TODAY: Will Argentina get punished for controversial banner? British PM supports FIFA inquiry