Former Greek Prime Minister Alexis Tsipras, the leftist firebrand who stormed to power on an anti-austerity agenda at the peak of Greece's debt crisis in 2015, resigned as a parliamentary deputy on Monday, amid rumours that he is preparing to launch a new political party. Tsipras became a global household name during Greece's fierce negotiations with international lenders over its third and final financial bailout, which ended in 2018. He was voted out of power in 2019, having been forced to accept the austerity he had campaigned against in opposition. "I'm resigning as a member of parliament with the Syriza party, I am not resigning from political action," Tsipras said in a filmed statement. Addressing his former colleagues later, he...