President Obama said Tuesday that Americans were wrong to doubt his signature healthcare reform law, saying concerns over rising costs or worsening health outcomes were not supported by the evidence.

In an interview with Telemundo on Tuesday, the president was asked if "everybody [was] wrong" after polling data indicated that a majority of Americans oppose the law and believe it will raise their healthcare costs.

"Yes," the president said with a chuckle. "They are."

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The president said a "look at the facts" revealed that young adults were able to stay on their parents' health insurance longer and that seniors were getting "billions of dollars in discounts on their prescription drugs."

Asked about reports that insurance rates were rising in some areas, Obama argued the law was a net positive.

"What we've seen is the lowest increase in healthcare costs in 50 years over the last several years," Obama said. "So there is no evidence at all that this is somehow making healthcare more expensive. There's a lot of evidence that it's helping to make it cheaper."

A poll released Tuesday by NBC News and The Wall Street Journal found that just 31 percent of Americans believed ObamaCare was a good idea, while 44 percent thought it was not. Just three in 10 Americans say they understand how the legislation will affect them, and only 23 percent believe the law will have a positive effect on the country's overall healthcare system.

Even more concerning for the White House, just 12 percent say the law will have a positive impact on their family, while 52 percent think the cost of their healthcare will go up.

State-based exchanges where uninsured Americans will be able to purchase health insurance are scheduled to open Oct. 1, with coverage slated to start at the beginning of 2014. The White House said earlier Tuesday that they expect a massive rollout ahead of the law's implementation, including $1 billion in private advertising and a significant public service campaign.

In his interview, the president said that once Americans are able to sign up for the plans, they will realize "it's gonna be a good deal."

"We expect that once it's fully implemented, a year from now, two years from now, five years from now, people will look back and they'll be asking, 'What was the argument about? Why is everybody fighting this so much?'"