Republicans have maintained that the legislation is ineffective and burdensome to enforce, and they have made it a priority to go after the measures.
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Colorado Republican leaders have begun a legislative push to repeal recently passed gun control measures, reigniting one of the most intense political debates in recent history.
The first advance came Monday as discussion started on several measures in each chamber. One of the most prominent measures — a longshot bill that would undo expanded background-check requirements on private and online sales — was passed by a Senate committee.