Disallowance and reservation are historical constitutional powers in Canada that act as a mechanism to delay or overrule legislation passed by Parliament or a provincial legislature. In contemporary Canadian history, disallowance is an authority granted to the governor general in council (federal cabinet) to invalidate an enactment passed by a provincial legislature. Reservation is an authority granted to the lieutenant governor to withhold royal assent from a bill which has been passed by a provincial legislature. The bill is then "reserved" for consideration by the federal cabinet.