If President Trump decides after all to replace Attorney General Jeff Sessions, who was approved just 166 days ago, the former Alabama senator would have one of the shortest tenures in history.

More than 80 Americans have been the nation’s top law enforcement officer as cabinet members, rather than acting placeholders. That list includes 39 Republicans and 30 Democrats. Another 13 attorneys general from other parties (Whig, Federalist, etc.) have also held the office.

The average tenure has been about 978 days — or roughly 2.5 years. Now it appears Sessions could get ousted after less than a half year.

Only two others have served shorter terms. One, Elliot Richardson, resigned in protest while serving under Richard Nixon during Watergate. The other, Edwin Stanton, took office in the tumultuous months before Abraham Lincoln became president.

Here’s the list, sorted from longest-to-shortest tenure: