Former NFL quarterback Tim Tebow was one of the few celebrity names included so far in the list of speakers for Donald Trump's convention next week. But Thursday evening, the Heisman Trophy winner took to Facebook to call the whole idea "just a rumor." In a video, Tebow said he just returned from the Philippines and “I wake up this morning to find out that I'm speaking at the Republican National Convention. Its amazing how fast rumors fly, and that’s exactly what it is, a rumor.”