Chief Minister Siddaramaiah confirmed the decision following a meeting with a Tamil Nadu delegation and a telephonic conversation with Chief Minister Stalin.

A statement issued by the Chief Minister's Office (CMO) in Bengaluru revealed that Tamil Nadu’s Forest Minister K. Ponmudy and Rajya Sabha MP Mohammad Abdullah Ismail met with CM Siddaramaiah at Cauvery Residence in Bengaluru to discuss the ongoing protest against what they referred to as the Union government's "anti-democratic stance" and alleged bias towards southern states.
The Tamil Nadu delegation urged CM Siddaramaiah to lend his voice to the protest and stand in solidarity against the delimitation proposal. Tamil Nadu Chief Minister Stalin had also previously spoken to Siddaramaiah over the phone on the same issue, the statement added.
"During discussions with the Tamil Nadu delegation and Chief Minister Stalin, CM Siddaramaiah expressed his full support for the opposition raised by the southern states," the statement said.
In his remarks, CM Siddaramaiah firmly stated, "We unequivocally condemn all actions of the Union government that undermine Karnataka's interests, weaken democracy, and contravene the federal principles enshrined in the Constitution. We will continue to extend our support to the fight against such moves."
Tamil Nadu CM Stalin also sent a letter to CM Siddaramaiah, formally requesting his support for the opposition against delimitation. In the letter, Stalin outlined two specific requests:
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"Your formal consent to join a Joint Action Committee (JAC) comprising Tamil Nadu, Kerala, Andhra Pradesh, and Karnataka in the south, alongside West Bengal, Odisha, and Punjab in the north," Stalin wrote.
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He also asked for the nomination of a senior representative from the Congress Party to serve on the JAC, to help coordinate a unified strategy.
In the letter, Stalin proposed an inaugural meeting in Chennai on March 22 to begin their collective action, stating, "This moment demands leadership and collaboration, rising above political differences and standing up for our collective good."