Kennedy, Johnson, Nixon, and Ford all resented the CIA, but they learned to work with it when unexpected crises hit.
President-elect Donald Trump and many GOP lawmakers have repeatedly called for an immediate repeal of the Affordable Care Act, but others are urging caution, wary of the political repercussions that could follow a rushed repeal.
The Senate voted 51-48 on Thursday to approve a measure instructing both chambers' committees to draft legislation to repeal the Affordable Care Act.
The outgoing president quoted Atticus Finch and highlighted accomplishments such as the legalization of same-sex marriage, health-care reform, and foreign policy work with Iran and Cuba.
President Obama will return to Chicago for his farewell speech Tuesday night. Aides say the address will be a 'call to action.'