(ABCNews) - The U.S. Supreme Court sided today with the Obama administration over its major healthcare overhaul, upholding federal subsidies across the country.

In a 6-3 ruling, the nation’s highest court ruled that critics’ reading of Obamacare might make sense in isolation, but not when viewed in a larger context and in light of the intention of the law.

It’s the second time the Supreme Court -- and its conservative chief justice, John Roberts -- has backed controversial portions of Obamacare. The first ruling was in 2012.

Justice Antonin Scalia wrote an angry dissent, saying the Supreme Court’s pair of decisions over Obamacare will “surely be remembered through the years” as evidence the court does “whatever [it] takes to uphold and assist its favorites.”

The chairman of the Senate Homeland Security Committee, Sen. Ron Johnson, R-Wisconsin, called the ruling “incredibly disappointing.”