Speculation about why the White House gave such short notice of the remarks runs the gamut. Some readers have emailed wondering if the White House didn't want to deal with the optics of weighing in on a national security crisis from a leafy vacation retreat. The fact that the remarks were recorded and are widely available renders that thesis ridiculous.
What is more likely is that the President had a golf game to get to. Per the print pool report sent out at 11:15 a.m., shortly after the president delivered his remarks:
The president is golfing.Full story at POLITICO
Immediately after delivering the statement on Egypt, the motorcade departed for Vineyard Haven. After an uneventful ride, we arrived at the Mink Meadows Golf Club a few minutes after 11am. ...