While the monarchy maintains formal executive authority over the country, those powers are constrained by law, precedent, and custom. For example, while the monarch appoints the prime minister, custom dictates that the monarch must appoint someone who has the support of the House of Commons. Thus, the Prime Minister's tenure in office is set by democratic election rather than by the monarch's choice. Moreover, the Prime Minister holds most of the actual power when it comes to setting and executing domestic and foreign policy.