The Constitution gives the President the power to nominate and, with the consent of the Commission on Appointments, appoint the heads of the executive department, ambassadors, other public ministers, consuls, or officers of the armed forces from the rank of colonel or naval captain and other officials provided by law.
It’s clear in this provision that the intervention of the CA, a legislative body, in a primarily executive function is for the purpose of check and balance, an important feature in a democracy.
But like many of the democratic institutions that have been perverted by politicians, the CA has been reduced to an extortion gang with members willing to sell their votes in exchange for favors from the nominee and the nominating authority.