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Under the legislation, senators have to take a one-year “cooling off” period before working as lobbyists and members of Congress will be prohibited from collecting a federal pension if they are convicted of corruption charges.

It also makes members of Congress pay market prices for air travel, ending their free or cut-rate flights on corporate and private jets.

The bill is the third of the Democrats’ top six priorities to reach Mr. Bush’s desk since they took control of Congress this year, a success that will help quell Republican criticism of an unproductive Congress.

The other priorities, part of the “Six for ‘06” agenda, to pass Congress were an increase to the federal minimum wage, which Mr. Bush signed into law in May, and the implementation of the remaining September 11 commission recommendations, which the president also is expected to sign.