Former GOP presidential candidate Steve Forbes and U.S. Rep. John Shadegg of Arizona will discuss the federal health care overhaul being considered by Congress at a news conference Tuesday in Phoenix.
The event will highlight a proposal that will appear on Arizona's ballot in November.
The measure would prohibit requirements that a person or employer participate in a health care system and would ban penalties against patients or businesses for paying for health services on their own.
Arizona voters narrowly rejected a similar proposal in 2008.
Republicans in more than a dozen states who oppose President Barack Obama's push for health care overhaul have sought state-driven efforts to block federal intervention in health care.