President of the Senate (Australia)
The position is provided for by Section 17 of the Constitution of Australia. The Senate elects one of its members as president at the start of each new term, or whenever the position is vacant. This is usually—though not necessarily—a member of the party or coalition that holds the most seats in the Senate. The largest party in the Senate is not always the governing party, as government is determined by the House of Representatives. The President of the Senate and the Speaker of the House of Representatives may consequently be from different parties.
National Security Committee (Australia)
The Prime Minister from time to time determines the membership of NSC. Under the current Morrison Government, the NSC is chaired by the Prime Minister and the membership includes the Deputy Prime Minister, Attorney-General, Treasurer, Minister for Foreign Affairs, Minister for Defence, and the Minister for Home Affairs.