Guam - The steps of the U.S. Supreme Court will be crowded tomorrow - as Washington waits for a ruling on the constitutionality of President Barack Obama's health care reform law.  While republicans in congress are vowing to repeal the law, the White House remains confident Supreme Court justices will rule in its favor.

"If the court does not strike down the entire law, the house will move to repeal what's left of it," said John Boehner of Ohio. White House spokesperson Jay Carney added, "The Affordable Care Act gives hard working, middle class families the security they deserve. We are confident the law is constitutional."

26 states brought the legal challenge - arguing congress overstepped its authority with the part of the law known as the Individual Mandate which requires all Americans buy health insurance or pay a penalty. The court tomorrow could let the entire law stand, strike it all down or just rule parts of it unconstitutional. Some of the law has already taken effect - allowing young adults to stay on their parents insurance - and closing the so-called "donut hole" - for prescription drug coverage Medicare misses.