Senate.
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The US President, who is head of the Executive branch, nominates (selects) US Supreme Court justices. They must then be approved by a simple majority (51%) of the Senate (Legislative branch). If the Senate votes in favor of the nominee, then the President makes the appointment.
presiodent
Assuming you mean, "Which branch of the Federal government has two members from each state? The answer is 'The Senate'.
The Chief of Staff is a position appointed by the President. If the elected President and Vice-President are unable to serve, the Speaker of the House of Representatives becomes President and selects a Chief of Staff.
The president considers all the plans and proposals forwarded to him by his team and selects the most viable for the whole country. The president consults other experts in order to get the most reasonable plans.