A federal judge declared the foundation of President Barack Obama’s health care law unconstitutional Monday, ruling that the government cannot require Americans to purchase insurance. The case is expected to end up at the Supreme Court.

In his order, U.S. District Judge Henry E. Hudson said he will allow the law to remain in effect while appeals are heard, meaning there is unlikely to be any immediate impact on other provisions that have already taken effect. The insurance coverage mandate is not scheduled to begin until 2014.