In 2008. President George W. Bush vetoed the Medicare Improvements for Patients and Providers Act
after it had passed Congress. Both houses of Congress voted to override the president's veto, and the act
became law on July 15, 2008

Explain which constitutional principle this scenario illustrates. What evidence led you to that conclusion?

The constitutional principle used in this scenario was Separation of Power

Explanation:

In the year  President George W.Bush  vetoed ,the Medicare Improvements for Patients and Providers Act  after it had passed Congress. the Congress used its  power to override that veto with a two-thirds vote in each house, and the act  became law on July 15, 2008 .

can you explain it better