President Donald Trump made abolishing the programme one of his main campaign pledges.
On Friday, O'Connor ruled that after Trump signed a $1.5 trillion tax bill passed by Congress past year that eliminated the penalties, the individual mandate could no longer be considered constitutional.
Klobuchar says the ruling Friday by the Texas judge contradicts the 2012 ruling by the U.S. Supreme Court that upheld the constitutionality of the Affordable Care Act. "The Senate could pass a nonbinding resolution expressing the body's support for why the decision ought to be overturned, or simply clarifying its intent when it repealed Obamacare's individual mandate", they reported Sunday.
O'Connor ruled that under the logic of the landmark 2012 Supreme Court ruling that upheld the law, the individual mandate, which required that most Americans obtain health insurance or pay a tax, is now unconstitutional.
Twenty Republican-led states brought the lawsuit.
O'Connor is a conservative Republican appointee who previously blocked other Obama-era policies. In addition to making it possible for millions of people to get health care through Medicaid expansion or exchanges, the Affordable Care Act prohibits insurers from turning away or charging more to individuals with pre-existing conditions, helps senior citizens save money on insurance and prescription drug costs, allows children to stay on their parents' health insurance plans until they are 26 and makes it possible for many Americans to receive cholesterol tests, mammograms, birth control and other vital medical services for free, according to CNN.
A major factor working against Republican efforts to repeal the law is that the argument about its invalidity, which revolves around the bill's use of an individual mandate, was already determined to not hold water by the Supreme Court. A spokeswoman for Becerra vowed a quick challenge to O'Connor's ruling.
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A key element of the current legal fight surrounding the ACA is the individual mandate, which requires most Americans to get health insurance.
The Affordable Care Act runs for more than 1,000 pages and includes many provisions - the exchanges for individuals that are frequently political footballs - and a long list of other measures and protections created to expand insurance coverage. "It would eliminate a lot of maternal care, all kinds of women's health".
The appeals process is expected to take some time, potentially as long as two years.
At Vox.com, Ezra Klein also calledthe ruling a "boon" to Medicare for All, whose support among Americans has skyrocketed in the last several years, with 70 percent of those surveyed in a recent Reuters poll reporting that they approved of the proposal. He likened the debate over which provisions of the law should stand or fail to "watching a slow game of Jenga, each party poking at a different provision to see if the ACA falls". "Today's misguided ruling will not deter us: our coalition will continue to fight in court for the health and wellbeing of all Americans".
The ruling throws a wrench into the plans of people who rely on Obamacare - or who have uncertain insurance coverage and a pre-existing condition.
The 55-page ruling late Friday from U.S. District Judge Reed O'Connor found the law invalid on the basis of the political and legal history of a few key provisions. "And that's because it was probably the most unpopular and unfair provision of the Affordable Care Act", Collins said.
Given the district court ruling in Texas, Schumer intends to make another run at securing a vote. United States, was filed in February.