Supporters of Yemen's Huthi rebels raise banners as they attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by MOHAMMED HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

Supporters of Yemen's Huthi rebels attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)

A member of security forces loyal to Yemen's Huthi rebels stands guard as supporters attend a rally denouncing the United States and the outgoing Trump administration's decision to apply the "terrorist" designation to the Iran-backed movement, in the Huthi-held capital Sanaa on January 25, 2021. (Photo by Mohammed HUWAIS / AFP)