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IOWA CITY, IOWA (AP) -- To the Republicans who are vowing to try to repeal his new health care law, President Barack Obama is saying, "Go for it."

His dare came at a rally in Iowa City Thursday afternoon, the first of many planned appearances at which Obama will try to sell the overhaul to voters in advance of the fall congressional elections.

The president addressed an estimated 3,000 people inside the University of Iowa Field House.          

Obama told the crowd that the bill he signed on Tuesday is the right step for America and will save the nation $1-trillion over the next two decades.

KTVO spoke with supporters of the bill and found they're pleased with the promise of health care to every American.

"From everything I’ve seen on it, there doesn’t look like there are too many things I can disagree with on it. It is going to help young people stay on insurance longer, uninsured people get insurance," said Butch Grob, a supporter of the new law.

Those against the legislation believed something needed to be done, but they thought the health care bill passed was not the right reform.

"There are certain parts that can be amended. I am in support of the general idea of health care reform. Maybe the money is a little bit too much," said Ian Martin,

Senate Republican leader Mitch McConnell of Kentucky said the GOP won't give up until the bill is "repealed and replaced with Common-sense ideas" that won't dismantle the current system and increase the debt.

(Copyright ©2010 by The Associated Press. All Rights Reserved.)