No, that's the old way. The new way is for the President to issue an executive order to have their target officially arrested, rendered somewhere overseas, and then follow up with an official order to have them assassinated (just declare them a foreign agent).
Any and all communications outside of the executive order would not be admissible as evidence even if the DOJ did want to prosecute!
Any and all communications outside of the executive order would not be admissible as evidence even if the DOJ did want to prosecute!