(Xinhua) -- A senior Islamic Resistance Movement(Hamas) leader on Saturday rejected Israeli government's decision not to release Palestinian tax revenues for fear of being used to fund Hamas. "Since the first day when Hamas won parliamentary elections more than a year ago, Israel has tried to blackmail the Palestinian people by withholding their money," said Khalil Abu Leila, chief of Hamas' foreign relations. The Israeli government has reportedly decided not to transfer600 million U.S. dollars of tax revenues to the Palestinian National Authority (PNA) for fear that the money will be used to bolster Hamas Islamists rather than moderate President Mahmoud Abbas. "In the past, they (the Israelis) have released 100 million U.S. dollars and it (the money) was spent in proper way...Hamas will not use any of this money because they are for the Palestinian people," Abu Laila argued. Earlier, Palestinian Information Minister Mustafa al-Barghouti said the PNA will start an international campaign to press Israel to release the money.