"I will raise this issue with the Prime Minister and Cabinet Secretary asking them since when junior-level officers are allowed to write such letters to state governments on their own", Parrikar told reporters here.
The imposition of "toll fee" on non-Goan vehicles has not gone down well with transporters with the All India Motor Transport Congress (AIMTC) resorting to indefinite strike demanding rollback of the fee since May 12.
"The state government would not respond to such a letter which is written by a down-the-line officer", Parrikar said.
Coming down heavily on Singh, the chief minister said he was doubtful about the "propriety" of the officer.
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"I want to ask him whether he is contesting the Lok Sabha polls by indulging in such tactics?", he questioned.
Parrikar said that ideally if the officer was approached by any association against the toll fee, he should have first asked the comments of state government.
He reiterated the state government's resolve to not withdraw the toll fee.
To shore up the state's revenues, the Parrikar government imposed a toll fee of Rs 1,000 on trucks while it is lesser for other vehicles.