Any launch in WA had nothing to do with POTUS flight paths to and from Singapore that I can find.
If it was a rogue launch, it violates a pile of safeguards that DoD would be insanely surprised at. More likely it was a planned launch, or it was a complete mistake during a drill, and when it got to a place where they could send a self-destruct, it was Boomed over the Pacific.
Unless it was a legitimate test.
And it will come out if it was a Broken Arrow, which would be more than outrageous.
But, anything is possible, but rogue launch is quite improbable these days.