Portuguese President Marcelo Rebelo de Sousa delivers a speech during a ceremony marking Portugal Day, the national day of Portugal, at the Jeronimos Monastery in Lisbon, Portugal, June 10, 2020. The day was marked all over the country in a serene emotional atmosphere as some citizens are still mourning the loss of loved ones to COVID-19 while looking into the future with optimism about return to "normal life." (Photo by Pedro Fiuza/Xinhua)

Portuguese President Marcelo Rebelo de Sousa delivers a speech during a ceremony marking Portugal Day, the national day of Portugal, at the Jeronimos Monastery in Lisbon, Portugal, June 10, 2020. The day was marked all over the country in a serene emotional atmosphere as some citizens are still mourning the loss of loved ones to COVID-19 while looking into the future with optimism about return to "normal life." (Photo by Pedro Fiuza/Xinhua)

Portuguese President Marcelo Rebelo de Sousa (C) listens to the national anthem during a ceremony marking Portugal Day, the national day of Portugal, at the Jeronimos Monastery in Lisbon, Portugal, June 10, 2020. The day was marked all over the country in a serene emotional atmosphere as some citizens are still mourning the loss of loved ones to COVID-19 while looking into the future with optimism about return to "normal life." (Photo by Pedro Fiuza/Xinhua)

Portuguese President Marcelo Rebelo de Sousa delivers a speech during a ceremony marking Portugal Day, the national day of Portugal, at the Jeronimos Monastery in Lisbon, Portugal, June 10, 2020. The day was marked all over the country in a serene emotional atmosphere as some citizens are still mourning the loss of loved ones to COVID-19 while looking into the future with optimism about return to "normal life." (Photo by Pedro Fiuza/Xinhua)

Portuguese Air Force aircrafts fly over a national flag during a ceremony marking Portugal Day, the national day of Portugal, at the Jeronimos Monastery in Lisbon, Portugal, June 10, 2020. The day was marked all over the country in a serene emotional atmosphere as some citizens are still mourning the loss of loved ones to COVID-19 while looking into the future with optimism about return to "normal life." (Photo by Pedro Fiuza/Xinhua)