Vested interests are launching a covert attempt to replace Finance Minister Sri Mulyani Indrawati following her stern moves to guard the state budget from abuse and clamp down on violators, sources say.Efforts to topple the "iron lady" intensified after she turned down requests from a major conglomerate for government assistance in saving its business empire in the wake of the global financial meltdown, sources said."Speculation has been rife for the past two or three weeks. I think the political motive is bigger than those of the economy, with the market showing confidence in the minister," said Andi Rahmat, a member of the House of Representatives' Commission XI, which oversees financial affairs, on Tuesday.Andi said a possible replacement for Mulyani, proposed by the vested interest, was Darmin Nasution, the Finance Ministry's director general of taxation."It's going to be a very risky move by President Susilo Bambang Yudhoyono to replace Mulyani