From Yahoo!:

The letter’s other signatories range from traditional left-wing organizations, like the American Civil Liberties Union, to conservative groups, such as think tank the R Street Institute. The second letter, to the Biden White House, was organized by Human Rights First and included a separate but overlapping group of signatories.

The organizations are urging Congress to sunset the 2001 legal authorization for the use of military force, originally aimed at allowing then-President George W. Bush to pursue al-Qaida after the 9/11 attacks, but since has been used to allow a number of military engagements. Signatories also want lawmakers to repeal the 2002 military authorization specific to Iraq and Saddam Hussein, which was most recently used by then-President Donald Trump as authorization for the targeted killing of Iranian military leader Gen. Qassem Soleimani.