The correspondence, part of the recently released Epstein files, described Anwar Ibrahim as someone who could benefit a US investment banker should he become prime minister.
The prominent whistleblower is being investigated for criminal defamation over claims by a woman named as a star prosecution witness in a corruption case involving the prime minister's former aide.
It follows a 10-month investigation into the dark world of migrant worker recruitment that has destroyed the lives of thousands of poor families.
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