days all about one issue in particular, immigration. he's been making things up, saying things that are demonstrably false but knows that immigration is the reddest of red meat for his supporters. polls show that. so the question is do his supporters care if what he says isn't accurate. we sent randi kaye to find out. >> reporter: in ft. myers, florida, thousands lined up for donald trump's rally, and for so many here, immigration is their top issue. >> when you watch that caravan and you see them carrying the flag from their country, that is called an invasion. >> reporter: that so-called invasion isn't one at all. in fact the caravan of migrants is nearly 1,000 miles away from the u.s. border, and mexican officials say they expect many of them to stay in mexico. so the president's announcement of sending troops has been met with deep skepticism, but not here. >> hey, why wait until the last minute? >> so not a campaign stunt in