I don't see a report other than the first from Canada Free Press which also notes:
The ice generally dissipates long before the aircraft lands, but there have been documented cases of blue ice clinging to aircraft surfaces until the aircraft reaches warmer air on approach to landing, then the ice may separate from the aircraft and fall to earth.
Clark County Director of Aviation Randall Walker was immediately notified and dispatched airport personnel to the campsite, but witnesses report that the blue ice had melted by the time officials arrived leaving only a smelly brown residue.
Walker told INSIDE VEGAS that he is personally investigating the incident, and will communicate his findings to the President’s staff.
Since the report appears nowhere but in CFP, a non aligned news source, even 24 hours after the alleged incident, I am registering a watch-warning on this article, but then again you never know. If some guy or gal on the street comes up offering president poop for a good price though, beware.