Overturning Arpaio's Pardon - Laurence Tribe and Joe Fein

[PoliticAverse]

1. Tribe's final argument is somewhat circular...

This is an unconstitutional pardon.
You can therefore impeach the President for issuing it.
Since you can impeach the President for issuing it it must be constitutionally voided.

Presidents have issued pardons for the crime of treason - a crime which threatens the existance
of the government itself and could deprive everyone of constitutional protections. If those pardons
weren't invalidated why would this one be?

The proper way to deal with a President who abuses the pardon authority is impeachment, as Tribe noted:

The framers suggested one solution to the prospect of such abuse. During a Virginia debate over whether to ratify the Constitution, George Mason worried that the president might “pardon crimes which were advised by himself.” James Madison replied that a president who did so could be impeached. Trump’s pardon of Arpaio should trigger congressional hearings on whether it constitutes an impeachable offense.