how does the president's legislative and judicial powers serve the principle of separation of powers?

Answer 1

The President has a veto power, the Legislature can override the veto of the President through a 2/3 vote of its members and the Judiciary can exercise judicial review of the acts of both the President and the Legislature. The above actions are examples of the separation of powers of each branch of government.

Answer 2

The President signs legislation into law (or vetoes it), thereby limiting the power of the Congress. Then the Judiciary can review those laws that are challenged in the courts. The President also appoints nominees to the Supreme Court, who conversely, must be approved by the Congress. If Congress did not need the President's signature on laws, there would be less of a check on their power, and if the Supreme Court appointed their own members, or Congress appointed them without presidential participation, the checks and balances would be less well-distributed.

Answer 3

I think you mean that the separation of powers is the Presidential branch, the Judicial Branch, and the Legislative Branch. Each branch serves as checks and balances so that one branch of government does not obtain all the power.

Answer 4

And which legislative and judicial powers would that be?

Last I checked he didn't have any.