"The Prime Minister maintaining silence on the Cauvery issue by not speaking about it when he came to Tamil Nadu... is condemnable," Stalin, Leader of the Opposition in the Tamil Nadu assembly, said in a tweet.
Modi had attended the launch of the state government's 'Amma scooter scheme' on Saturday.
At the time, Chief Minister K Palaniswami had urged him to expedite the formation of the Cauvery Management Board and the Cauvery Water Regulatory Committee as per the directions of the Supreme Court.
The BJP had acted in "haste" on the issue of National Entrance-cum-Eligibility Test in Tamil Nadu, Stalin said in an apparent reference to the stiff resistance to the test in the state.
BJP should not adopt a similar approach vis-a-vis Cauvery, he added.
"The CMB should be constituted within six weeks. Don't make Tamil Nadu a protest zone for electoral gains in Karnataka," Stalin said in another tweet.
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