The legislation would reduce mandatory minimums for certain drug offenses and largely ban solitary confinement for juveniles.
Despite U.S. and Israeli opposition, the United Nations is expected Thursday afternoon to pass a Palestinian bid recognizing a Palestinian state, and give it non-member observer status at the U.N.
Currently, the only state with that status is the Holy See (Vatican).
The move could open the way for Palestinians to bring war crimes charges against Israel at the International Criminal Court.
The U.S. and Israel say it will complicate efforts to achieve an independent Palestinian state through peace talks.