murder is an unlawful killing, killing foreigners we are engaged in armed conflict with, is lawful.Obama revealed to the public the details of why he ordered that individual to be taken out. Trump has not revealed to the public any details on the reasons he's ordering those people whacked other then accusing them of being drug smugglers.
Some think it's stone cold murder.
So you fail
Obama's justification to execute Americans, can be found here...https://www.justice.gov/sites/default/files/oip/legacy/2014/07/23/dept-white-paper.pdf
Trump can use the same justification, but doesn't need to, since we are dealing with foreigners not protected by the US Constitution