US President Joe Biden takes off his face mask he meets with NATO Secretary General during a NATO summit at the North Atlantic Treaty Organization (NATO) headquarters in Brussels on June 14, 2021. AFP

A protester, depicting a detainee of the US detention facility at Guantanamo Bay, Cuba, stages a demonstration with others during a NATO summit in Brussels, Monday, June 14, 2021. AP

Go Joe - Close Guantanamo'

Protesters, one depicting a detainee of the US detention facility at Guantanamo Bay, Cuba, stage a demonstration during a NATO summit in Brussels, Monday, June 14, 2021. AP

Protesters hold photos of people being held at the US detention facility at Guantanamo Bay, Cuba, during a demonstration during a NATO summit in Brussels, Monday, June 14, 2021. AP

Protesters hold photos of people being held at the US detention facility at Guantanamo Bay, Cuba, during a demonstration during a NATO summit in Brussels, Monday, June 14, 2021. AP

Protesters, one depicting a detainee of the US detention facility at Guantanamo Bay, Cuba, stage a demonstration during a NATO summit in Brussels, Monday, June 14, 2021. AP