After a foreign policy speech in Las Vegas Saturday, Mitt Romney was again confronted with questions about the Massachusetts healthcare law he signed as governor.

Romney has been in Las Vegas for the last couple days. He made an apperance at a North Las Vegas neighborhood hit by the foreclosure crisis Friday before speaking to the Republican Jewish Coalition on Saturday.

During his speech, he criticized President Obama's handling of foreign policy, touching on his engagement with Iran, Israel and North Korea. 

"The consequences of seeing someone learn on the job has not been pretty," Romney said, according to the Las Vegas Review-Journal. "Obama is either unwilling or incapable of dealing with [Iran's nuclear program]. Israel's very existence may be at stake."

Romney did not mention Libya, where American forces, led by NATO, are conducting a bombing campaign against Col. Moammar Gadhafi's forces.

He did, however, address healthcare, which is considered his achilles' heel in the race for the GOP presidential nomination. While he was governor of Massachusetts, he signed that state's controversial healthcare plan -- which includes an individual mandate -- into law. Romney defended that move during a question-and-answer session after the speech.

But he said the Massachusetts plan does not mirror the legislation passed by Democrats in Congress last year.

"I would never do what President Obama did, which is usurp the power of states and replace it with an overreaching federal hand," Romney said, according to the Boston Globe. "That's the wrong way."

He reiterated his call to grant waivers to states wishing to opt out of the law, and then work to repeal it. The former governor said he wouldn't shy away from the issue.

“If we get the chance to talk about health care, it will be fun," Romney said. "Because of course he does me the great favor of saying that I was the inspiration for his plan. I'll say, if that's the case, why didn't you call me? Why didn't you ask me what was wrong? why didn’t you ask ... what worked and what didn't?'"

Romney continued: "I can’t wait to have those conversations, and I'll take it to him. On the other hand, I'm not going to go after people on innuendo and personal attacks. I’m going to go after people I disagree with on policy."

Asked what kind of campaign he would conduct against the president, Romney said it would be no holds barred.

"I will take him on head on and aggressively if I’m the nominee," Romney said.