The Judicial branch can check the power of the Executive branch by 1.ruling its acts unconstitutional.
2.not ratifying its treaties.
3.impeaching the President.
4.overriding the President's veto

1.ruling its acts unconstitutional.

Explanation:

Judicial branch may check both the legislative and executive by declaring laws unconstitutional. Obviously, this is not the whole system, but it is the main idea.

presidency should be the title

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explanation: