Alexis Tsipras, the Syriza leader, said he would help the government if it took measures to alleviate the burden on the people. “But it must understand that austerity measures and the selling off of public wealth cannot be imposed,” he said. “Anti-austerity is the only viable solution.” Any New Democracy-led government will be under intense pressure to renegotiate the terms of Greece’s bail-out to stave off another political collapse and civil unrest.