"The revelations made by Jayanthi Natarajan in her letter to Sonia Gandhi, which have become public today, are a matter of great concern and is a serious issue," he said.
He said as environment minister, it is his duty to review those specific files where extraneous influence has been alleged as per the letter.
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Natarajan had written a letter to Congress President Sonia Gandhi alleging that she had received specific requests from Rahul Gandhi on environmental clearances and consequently had rejected big ticket projects.
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