Note that the notwithstanding clause has never been used by the federal government (the "parliament" you referenced).
It's a shitty clause, and should be removed but it was put in at the behest of certain province(s) as the only way to get the Charter of Rights and Freedoms at all, and has only been used by provincial governments (aka legislatures, though a few provinces do call them "provincial Parliament").
It's a shitty clause, and should be removed but it was put in at the behest of certain province(s) as the only way to get the Charter of Rights and Freedoms at all, and has only been used by provincial governments (aka legislatures, though a few provinces do call them "provincial Parliament").