So you agree, The good Senator died on Saturday, Sunday was half-staff, and Monday, the flag should not be at half-staff. The news people and those that complained about it being not at half staff today are ignorant."On the day of death and the following day for a Member of Congress." From, https://en.wikipedia.org/wiki/Half-mast#United_States
So he over corrects by, "signed a proclamation to fly the flag of the United States at half-staff until the day of his interment."