The Greek prime minister his finance minister as part of a broad cabinet reshuffle - an example of reforms aimed at tiding over the country's crippling debt crisis despite popular resentment. George Papandreou's move came two days after protesters angry with harsh austerity measures clashed with riot police in the capital, Athens. George Papaconstantinou, the finance minister, will move to the environment and energy ministry. He will be replaced by Evangelos Venizelos, a government spokesman said on Friday. Venizelos, an influential socialist politician, had challenged Papandreou for the party leadership four years ago. Papandreou had said he would also seek to build consensus among various political parties while sticking to the course of reforms. "We have some tough negotiations ahead of us and the next few days will be crucial ... These are critical moments for the country and we must have stability," he told parliament on Thursday.