Mr Karunanidhi had said party would review its ties with the UPA if the Centre opposed the US resolution.
Mr Karunanidhi has gone on record saying, "The DMK will deem it as a betrayal of Tamils if the Centre does not support the resolution on Sri Lanka."
Prime Minister Manmohan Singh had hinted that India would not support the US resolution. However, sources had earlier told NDTV that the government has assured the DMK that it will consider the sentiments while voting in UN.
After Trinamool Congress, the DMK is the largest ally of the Congress-led UPA with 18 members.
The DMK has not been the easiest partner for the Congress. Its relations with the DMK have not been the most cordial ever since Mr Karunanidhi's close aide A Raja and then his daughter Kanimozhi, went to jail in the 2G scam last year. The DMK, with its 18 MPs too has regularly given the Congress a hard time with its brinksmanship and opposition to key policy.
The allied party had embarrassed the government by disrupting the President's speech on the first day of the Budget session.
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