In his speech Sunday after last week’s gun massacre in San Bernardino, Calif., President Obama demanded that Congress “make sure no one on a no-fly list is able to buy a gun. What could possibly be the argument for allowing a terrorist suspect to buy a semiautomatic weapon?”

On the surface, the issue does seem like a no-brainer. Delve deeper than the sound bites, however, and it’s a lot more complicated.

Obama, a former professor of constitutional law, should know that. Of course allowing a terrorist to buy a gun is crazy. The real question, though, is whether the no-fly list is the right tool. Until the federal government cleans up the list and the process, the answer is no.

The list was an understandable way to try to prevent more terrorists from getting on planes after 9/11, but the way it worked should have made Americans deeply uneasy. The list presumes you’re guilty until proven innocent, which gets one of the nation’s most important constitutional guarantees exactly backwards.

Last year, a federal judge found government management of the list unconstitutional, ruling that the way people get put on the list with no notice, and no meaningful way to get off if they’re on by mistake, violated the Fifth Amendment guarantee of due process. That forced the administration to begin changing things.

USA TODAY

Rep. Mike Thompson: Close loophole on terror list

As far as is known, the process remains imprecise. People whose names are the same as someone on the list have been subject to extra checking at airports — as the late Sen. Ted Kennedy, D-Mass., learned repeatedly at airports because there was someone on the list named “T. Kennedy.” Journalists, entertainers, U.S. military veterans and others have been wrongly put on the list, or confused for people on it. The ACLU represented 13 people who claimed they should never have been on the list, and the government had to admit that at least seven of them should be taken off, and promise to change the process for challenging inclusion.

As if all this weren’t enough, it’s not even clear what list supporters are talking about. The government has several. Obama mentioned the no-fly list, but a House bill doesn’t mention a list at all. Backers say they expect the attorney general to rely on the FBI’s terrorist watch list, which includes more than 800,000 people, though about 95% are foreign nationals and can’t buy guns anyway.

As with just about everything else involving guns, the watch-list fight is dividing along party lines. Last week, the Senate’s Republican majority rejected legislation to bar gun sales to people on the list. On Thursday, however, Connecticut Gov. Dannel Malloy, a Democrat, announced that his state would put the ban in place by executive order, a move likely to face legal challenges.

Like it or not, the Supreme Court has ruled that Americans have a Second Amendment right to buy and own guns, subject to reasonable regulation. Such regulation should include universal background checks and bans on sales of military-style assault weapons and high-capacity magazines. But denying a constitutional right for certain citizens, based on  a secret government list, just doesn’t meet the test of American values.