What is the scope of judicial review of exercises of the exercise of the foreign affairs prerogative power for constitutionality?

The limited power of the courts to review exercises of the prerogative power for constitutionality reflects the fact that in a constitutional democracy, all government power must be exercised in accordance with the Constitution. This said, judicial review of the exercise of the prerogative power for constitutionality remains sensitive to the fact that the executive branch of government is responsible for decisions under this power, and that the executive is better placed to make such decisions within a range of constitutional options. The government must have flexibility in deciding how its duties under the power are to be discharged: see, e.g., Reference re Secession of Quebec, 1998 CanLII 793 (SCC), [1998] 2 S.C.R. 217, at paras. 101-2. But it is for the courts to determine the legal and constitutional limits within which such decisions are to be taken. It follows that in the case of refusal by a government to abide by constitutional constraints, courts are empowered to make orders ensuring that the government’s foreign affairs prerogative is exercised in accordance with the constitution: United States v. Burns, 2001 SCC 7 (CanLII), [2001] 1 S.C.R. 283.