A former political lobbyist in the US has pleaded guilty to fraud charges in a case that could lead to the prosecution of senior members of President George Bush’s Republican party.Jack Abramoff has agreed to cooperate with prosecutors in their probe into alleged corruption in Congress. Abramoff is accused of using money defrauded from Indian tribes to bribe politicians. A Justice Department official said: “The Justice Department will agressively investigate and prosecute these types of cases which have a devastating impact on the public’s trust of government. We will not shy away from that responsibility no matter where the trail leads.” It is not clear if it will lead to the White House but former House of Representatives Majority leader, Tom DeLay is under the spotlight. Prosecutors claim Abramoff directed his Indian clients to hire the public relations firm of a former Delay aide. It alleged the pair used millions in kickbacks from the deal to shower gifts on Congress members in return for political favours. DeLay’s lawyers deny he gave Abramoff and his clients favourable treatment in return for election campaign contributions.