No. Article I, Section 9, paragraph 3 of the Constitution prohibits Congress from passing ex post facto laws.
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passing ex post facto laws
Assuming this is about the united states, to pass an ex post facto law is no kind of power, it is prohibited by the constitution.
Ex post facto laws are specifically prohibited by the Constitution.
Ex post facto laws are laws that act retrospectively. The law changes the legal consequence of an action that was committed before the enactment of the law. For example, an action that was not criminal in 1990 may be regarded as a crime if new legislation is passed to ban the action.