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In his Twitter account, the former Pandan MP said: "they're busy talking about why I didn't expose the Penang tunnel, I'll answer it tomorrow," he wrote.
Recently, Umno Supreme Council (MKT) member Datuk Puad Zarkashi challenged Rafizi for not exposing the Penang tunnel project involving former Penang chief minister Lim Guan Eng.
However, Rafizi said the challenge could be due to Umno's inability to respond to his previous revelations including the 1Malaysia Development Berhad (1MDB), Majlis Amanah Rakyat (MARA), Felda, Armed Forces Fund Board (LTAT) and LCS.
