"Karnataka has taken the right step. It is a welcome one," party spokesperson TKS Elangovan told reporters here.
Dravida Munnetra Kazhagam (DMK) president M Karunanidhi, besides other leaders, had been urging the Karnataka government to appeal against Jayalalithaa's acquittal.
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Tamil Nadu Congress Committee chief EVKS Elangovan lauded his party-led government in Karnataka for "quickly deciding" on approaching the apex court with an appeal before the 90-day deadline.
"The (Karnataka) high court had completely turned down the sentence awarded to Jayalalithaa and three others (N Sasikala, J Ilavarasi and VN Sudakaran) by the trial court. After two such different judgements there will be justice in the Supreme Court," he said in a statement.
Pattali Makkal Katchi (PMK) founder S Ramadoss, who had written to Karnataka chief minister Siddaramaiah asking his government to appeal against Jayalalithaa's acquittal, said: "albeit a little delayed decision, it is a welcome one."
Ramadoss said if the Karnataka government had immediately heeded to his demand, "at least Jayalalithaa becoming chief minister could have been avoided" by trying to secure a stay against the high court verdict.
"Karnataka should file an appeal, highlighting the loopholes and seek a stay order against the High Court judgement," he added.
BJP state unit president Tamizhisai Soundararajan said since two different verdicts were given in this case -- conviction by lower court and acquittal by High court-, the appeal will give "clarity" to the people of the state.