in a parliamentary system from where are cabinet members drawn
Cabinet (government) In parliamentary democracies, several policies exist: cabinet members must, must not, or may be members of parliament, depending on the country. In the United Kingdom, cabinet ministers are mandatorily appointed from among sitting members of the parliament. In countries with a strict separation between the executive and legislative branches of government, e.g. Luxembourg, Switzerland and Belgium, cabinet members have to give up their seat in parliament. The intermediate case is when ministers typically are members of parliament, but are not required to be, as in e.g. Finland. The candidate prime minister and/or the president selects the individual ministers to be proposed to the parliament, which may accept or reject the proposed cabinet composition. Unlike in a presidential system, the cabinet in a parliamentary system must not only be confirmed, but enjoy the continuing confidence of the parliament: a parliament can pass a motion of no confidence to remove a government or individual ministers. Often, but not necessarily, these votes are taken across party lines.
United States presidential line of succession The succession follows the order of vice president, Speaker of the House of Representatives, President pro tempore of the Senate, and then the heads of federal executive departments who form the Cabinet of the United States. The Cabinet currently has fifteen members, beginning with the Secretary of State, and followed by the rest in the order of their positions' creation. Those heads of department who are ineligible to act as president are also ineligible to succeed the president by succession, for example most commonly if they are not a natural-born U.S. citizen.