It means that we should not have 1 main ruler, but have equal power spread amongst several others, so that there is not a king or tyrant that controls all.
Chat with our AI personalities
Montesquieu
Yes, the power to check other government branches is a non-legislative power
Through the veto power.
The federal courts can check the Presidents power by that courts can declare executive actions unconstitutional.
Congress can check the power of the Supreme Court by introducing amendments to the Constitution.