The U.S. Supreme Court, for the second time in three years, has affirmed the legality of key provisions of the 2010 Patient Protection and Affordable Care Act,  a measure that is viewed as one of President Obama's central legislative achievements.

In a 6-3 opinion issued on June 25, the court said that federal tax credits that enable individuals who cannot otherwise afford health insurance to purchase coverage are permissible under the Affordable Care Act and are in line with what Congress intended when it wrote the law.