Which position, appointed by the president, advises the president on matters of national defense?

senator

cabinet member

federal judge

ambassador

A cabinet member will advise the president

A cabinet member advises the president on matters of National defense

Explanation:

A senator is not an appointee by the president, but he/she is been Elected by the populace while a federal judge is been recommended by the President to defend the constitution. an ambassador also been appointed by the President represents the interest of the country especially in another country and doesn't advice the president on matters concerning the National defense .

An executive cabinet member advises the president on many matters  including National defense. the particular cabinet member who is charged with this responsibility is the National security adviser (  NSA ) and also the chief of defense staff

there has only been 12 presidents. the 12th president is/was moon jae-in