The DMK has one union minister and four minister of states in the union council of ministers.
It has 18 MPs in Lok Sabha and has been one of the largest non-Congress constituent of the central alliance in its two terms.
The DMK chief said India should press for amendments to the US resolution in the UNHCR to demand an independent international probe into the genocide that took place in Sri Lanka.
Thousands of innocent Tamils were massacred by the Lankan army during the decisive push against LTTE in 2009.
Karunanidhi also said the resolution should seek identification of war criminals and then take action against them.