Probably not, though you might be able to make a case that if a particular non-citizen is a significant perceived threat but there is no legal mechanism for prosecuting them then different rules apply. Most people are not cosmopolitan however and so I am more surprised at the lack of outrage over ordering the assassination of a US citizen than by the lack of outrage over the assassination of non-US citizens.
Probably not, though you might be able to make a case that if a particular non-citizen is a significant perceived threat but there is no legal mechanism for prosecuting them then different rules apply. Most people are not cosmopolitan however and so I am more surprised at the lack of outrage over ordering the assassination of a US citizen than by the lack of outrage over the assassination of non-US citizens.