President Trump has pardoned Joe Arpaio which absolved the former Arizona sheriff for defying a federal court order. In a statement, the White House said "Throughout his time as Sheriff, Arpaio continued his life’s work of protecting the public from the scourges of crime and illegal immigration." and that "Sheriff Joe Arpaio is now eighty-five years old, and after more than fifty years of honorable service to our Nation, he is [a] worthy candidate for a Presidential pardon." This was Trump's first pardon since taking office and he did it relatively earlier than presidents before him. The article describes him as a "proto-Trumpian figure" based on the way he treated undocumented immigrants and criminal suspects. This might have contributed to why Trump pardoned him. This article demonstrates the ability of the president to override a Supreme Court ruling of a criminal. If he believes the trial was unfair or just that the person deserves to be free he can do so. So the Supreme court does not have the final word of authority on criminals.
The Connecticut Supreme Court outlawed the death penalty in that state. This comes three years after Connecticut decided to abolish capital punishment while leaving death sentences on inmates who were already on death row. Other states in this situation have issued life sentences without parole as a substitute for the death penalty for current death row inmates. This is an example of the checks that the Supreme Court can issue. Even though the death penalty law was passed, the Supreme Court ruled that it was unconstitutional. So even if both the Legislative and Executive branches sign off on a bill, the Judicial branch is still able to override that.
Just as was predicted, Congress overrode Obama's veto on the 9/11 lawsuit bill. This the first override of his presidency. The override was overwhelming with the Senate voting 97 to 1 and the House 348 to 77. White House press secretary Josh Earnest called the vote "the single most embarrassing thing the United States has done possibly since 1983." After the fact, several lawmakers are now agreeing with Obama's veto and are looking at ways to scale it down once it becomes law. This is an example of one of the checks and balances that Congress has on the Executive Branch. The president's veto is not all powerful and, if Congress has enough votes, they can override it. This allows a more fair government because it is not completely up to the President to decide when a bill should be passed or not.
President Obama vetoed a bill that would allow the family members of 9/11 victims to sue Saudi Arabia. This put him against Congress which is expected to override his veto. Obama believed that doing so would seriously hurt national security interests and jeopardize important alliances. It would also open Americans abroad to prosecutions by foreign countries as it would remove agreements that protect both sides from lawsuits. Doing this had negative effects on the president because it put him at odds with family members of 9/11 victims. This demonstrates the President's power to veto any bill proposed by Congress. In this case, the veto was very unpopular and it is likely that Congress will use it's power to override the veto.