"In the eight years since passage of the original Patriot Act, it's become clear that the escalating political competition to appear tough on terror - and avoid being accused of being "soft on terror" - brings perceived electora lbenefits with few costs, with vital but fragile civil liberties being easily sacrificed," he added.

In contrast to the Senate, the House of Representatives Judiciary Committee approved a version of the legislation containing several significant reforms. In a 16-10party-line vote, the committee's version curbs some of the government's controversial surveillance powers.

The Patriot Act, passed by a landslide after the 9/11 terrorist attacks to provide law enforcement and intelligence agencies additional powers to thwart terrorist activities, was reauthorised in 2005.

The legislation has been criticised by many from across the ideological spectrum as a threat to civil liberties, privacy and democratic traditions. Sections of the original act have been ruled unconstitutional, with certain provisions violating protected rights.

Judiciary Chair John Conyers, a Michigan Democrat, said the goal of the new legislation was to "craft a law that preserves both our national security and our national values".

The proposed new legislation would permit the so-called "lone wolf"provision to sunset. This authority removed the requirement that an individual needed to be an agent of a foreign power to be placed under surveillance by intelligence officials and permitted surveillance of individuals with a much lower evidentiary threshold than allowed under criminal surveillance procedures.

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