Allegations of continued intelligence-sharing with the United States could prove embarrassing for Abbas who has been on a political collision course with Washington since President Donald Trump's recognition in December of contested city of Jerusalem as Israel's capital.
The claims are contained in a 37-page anonymous document that was been shared widely among Palestinians, mostly on WhatsApp.
The author describes himself as a former member of the surveillance unit who quit "this dirty job" several months ago because of his growing opposition to Palestinian government practices, including intelligence-sharing with the United States. He wrote that Trump's policy shift on Jerusalem provided another impetus to go public.
Bar association head Jawad Obeidat told The Associated Press on Monday that transcripts of his phone conversations, as published in the document, were accurate.
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"This is a blatant violation of human rights," he said. Tawfiq Tirawi, an outspoken Abbas critic and West Bank intelligence chief from 1994 to 2008, said he checked with his contacts and believes the document is authentic.
The CIA declined comment.
In mid-January, when the document first surfaced, Palestinian security services said in a joint statement that it was part of a "plot" seeking to harm the political and security establishments.
The allegations come at a low point in Palestinian relations with the United States, following Trump's policy pivot on Jerusalem, whose Israeli-annexed eastern sector the Palestinians seek as a future capital.
Abbas said at the time that he was suspending contacts with US officials dealing with the Israeli-Palestinian conflict. The US shift on Jerusalem angered many Palestinians, and in this context, allegations of continued intelligence- sharing with the US could pose a domestic political problem for Abbas.
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