A group of Youth Congress workers raised slogans and waved black flags at Tankha as he stepped out of a posh hotel here to proceed to the High Court, police said.
A small group of Youth Congress workers were detained for allegedly trying to stop his car at the hotel gate, they said.
Congress leaders including former PCC Chief V M Sudheeran and Leader of the Opposition in Kerala Assembly Ramesh Chennithala have expressed their displeasure over the Madhya Pradesh MP's decision to defend Chandy, an NCP nominee in the CPI(M)-led LDF government.
Sudheeran attacked Tankha, saying his appearance for Chandy was an "insult" to the UDF.
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Tankha, who arrived here last evening, however maintained that he was appearing on behalf of Chandy in court in his professional capacity as a lawyer.
In a tweet, the MP said, "In Cochin t argue a matter f old friend n professional capacity f lawyer.. Rare instance of a Minister compelled t challenge a dist Col order."
The opposition Congress-led UDF and the BJP have been demanding the resignation of Chandy over allegations of land encroachment.