The increase of presidential powers are usually done in extreme situations such as the suspension of Habeas Corpus, the introduction of martial law and is usually for a short period of time.
The reduction in presidential powers exists in situations where the system of government is Confederal and the bulk of power is with individual states.
What is Imperial Presidency?
This refers to the circumstance where a modern president gets his powers beyond the ones allowed by the Constitution and this can lead to abuse of power.
Hence, with increased presidential powers, it tends to bring in dictatorial tendencies and that is why there is the separation of powers and the principle of checks and balances within a democratic system between the Judiciary, Legislature and Executive.
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