Prohibiting people listed on the government’s secret terrorist watchlist and its secret subsidiary, the federal no-fly list, from buying guns is again on the table. President Obama expressed the argument simply the other night when he said, “If you’re too dangerous to board a plane, you’re too dangerous, by definition, to buy a gun.”
“No person shall [...] be deprived of life, liberty, or property, without due process of law.”
The secret process of compiling the terrorist watchlist is not due process.
Liberty can only be taken away for just cause. That includes the right to purchase and possess firearms. The laws and the courts have laid out the acceptable causes and process for denying that right. Your name on a secret list that is compiled by government agents without any sort of due process or means of redress does not qualify as a due process for prohibiting a constitutionally guaranteed right.