Antonis Samaras, head of the New Democracy party and former prime minister of Greece has resigned from his position as head of Greece’s main opposition, following a landslide victory of the “No” vote in the Greek referendum.

Alexis Tsipras’ Syriza party swept to power in January after a decisive victory over Samaras’ party, which was viewed by many in Syriza as destructive for agreeing to harsh bailout terms set forth by Greece’s creditors.