The veto power of the president under the u. s. constitution best reflects the principle of

It reflects the principle of "Checks and Balances". Checks and balances is when the 3 branches get to check on each other to make sure that no branch is abusing their power. The judicial branch can declare a law unconstitutional, and can impeach the president if necessary. The executive branch elects the judges for the Supreme Court, and can veto a law. The legislative branch can override a veto