Obama clearly feels that he can issue an Executive Order changing immigration laws that Congress passed long ago, even repealing the deportation mandated by those laws.

Why can't a Republican President do the same, to a law passed by Congress, such as Obamacare? I'm sure the Republican President will be unhappy with lots of things in the Obamacare law, just as Obama is unhappy with things in the immigration laws.

If Obama can change or repeal the immigration laws simply by issueing an Executive Order that goes directly against what those laws say, then surely a Republican President can do the same to Obamacare, issuing an EO that goes directly agains what the Obamacare law says. For example, eliminating the mandate. Or eliminatinng the requirements for insurance policies that are causing so many companies to cancel people's existing policies because they don't qualify under Obamacare. Or repealing the whole thing, simply because he feels the law is wrong and creates more problems than it solves.

The only significant diffference between the two cases, is that the Constituution clearly gives Congress the authority to set uniform standards for naturalization. But it gives them no authority at all, to run health insurance plans or regulate them.

In fact, the "Welfare Clause", which requires that all programs passed by Congress must affect all Americans equally, is clearly violated by Obamacare, which gives taxpayer money to some while taking it away from others.

Why can a President not use an EO to change or eliminate the parts of Obamacare he doesn't like, if he can do that to immigration laws?