The federal Liberal government's immigration policies have come under scrutiny following the arrest of two Toronto residents, Ahmed Fouad Mostafa Eldidi, 62, and his son, Mostafa, 26, on terrorism charges. Police say the pair were in the “advanced stages of planning a serious, violent attack in Toronto,” and had a machete and axe in their possession. The arrests have sparked a debate over how someone with alleged ties to ISIS was able to enter Canada and, in one case, even become a citizen.