The president has all of the following expressed powers under the constitution EXCEPT: a. to grant reprieves and pardons for federal offences.
b. to convene Congress in special sessions.
c. to commission officers in the armed forces.
d. to exercise the line-item veto.
e. to appoint ambassadors, subject to Senate confirmation.

d. to exercise the line-item veto.

Explanation:

Unlike the other powers in option a, b, c, and e, the power to exercise the line-item veto is not expressly stated in the US Constitution. This power, which would allow the President to nullify or reject specific provisions of a bill (instead of vetoing the whole bill), has been widely debated in Congress and is not a power that the US President has nowadays. However, most American States have given their governors line-item veto powers to a certain extend.

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