It would seem that The Won has actually taken the time, and briefed his Tele-Promp-Ter on the application of that law. Fitting, in view of Thursdays attack in Texas, the President has ordered flags to half-staff until sunset on Veterans Day, 11/11. For once, good proper use of presidential authority:
Flag Code of the United States
By order of the President, the flag shall be flown at half-staff upon the death of principal figures of the United States Government and the Governor of a State, territory, or possession, as a mark of respect to their memory. In the event of the death of other officials or foreign dignitaries, the flag is to be displayed at half-staff according to Presidential instructions or orders, or in accordance with recognized customs or practices not inconsistent with law. In the event of the death of a present or former official of the government of any State, territory, or possession of the United States, the Governor of that State, territory, or possession may proclaim that the National flag shall be flown at half-staff.