Portugal has since reintroduced checks several times along its border with Spain , during the UEFA Euro 2004 championships and when Portugal hosted the NATO 2010 Lisbon summit . The most recent checks were temporarily reintroduced on the border from May 10 , 2017 to May 14 , 2017 , during Pope Francis 's visit to Fátima , Portugal
2010 Lisbon summit
2010 Lisbon summit
Schengen Agreement