President Bush wants to keep U.S. aid flowing to Pakistan even though there is evidence the country is violating rules against nuclear weapons proliferation, administration and congressional sources say.

Senior State Department officials are working on Capitol Hill to lift the legal requirement that bars Pakistan, the third largest recipient of U.S. aid, from getting any money if it presses ahead with nuclear bomb development.U.S. aid to Pakistan technically came to a halt Monday, the beginning of the 1991 fiscal year, because Bush had not issued the required annual certification that Pakistan does not possess a nuclear bomb and that continued U.S. aid will reduce the prospect for development of atomic weapons.