Americans protest against healthcare act People hold banners during a protest in front of the U.S. Supreme Court building in Washington D....

Americans protest against healthcare act

People hold banners during a protest in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.(Xinhua/Fang Zhe)

Former Republican presidential candidate, U.S. Rep. Michele Bachmann (C, Front) speaks to people protesting in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.(Xinhua/Fang Zhe)

People hold banners during a protest in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.(Xinhua/Fang Zhe)

People hold banners during a protest in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.(Xinhua/Fang Zhe)

People hold banners during a protest in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.(Xinhua/Fang Zhe)

People hold banners during a protest in front of the U.S. Supreme Court building in Washington D.C., capital of the United States, on March 27, 2012.

The U.S. Supreme Court on Monday began three-day oral arguments in the landmark case involving the Affordable Care Act, the signature healthcare overhaul of President Barack Obama.