this is the first i've heard of this, but i would urge the senate to block this bill on the grounds that it is creeping monarchism, and uncanadian for that reason.
these powers should be given to an elected minister, in this case the minister of immigration, and not to an unelected figurehead of the monarch.
most canadians would be baffled by this provision if they were aware of it, and nobody would oppose it more than the british parliament would.
mr carney is identifying himself as a monarchist, and that is a position that is uncanadian and not welcome here.