99% of what Trump says are incomplete rambling statements. Beats me how they can determine truthfulness, I can't even figure out what he is talking about!
Well, I know it was probably rhetorical, but PolitiFact actually lists the quotes and explanations of each claim they tackle and why they rate it what they rate it, so you can see every claim they are reviewing and what the truth actually is. Here are two examples from Trumps "Pants on Fire" section:
Trump Statement A:"Frankly, (Hillary Clinton) doesn’t do very well with women."
"...Trump went on to say that Clinton’s standing among female voters in particular is nothing to write home about.
"Frankly, (Hillary Clinton) doesn’t do very well with women," Trump said. "If you look at what happened recently, … in the last two weeks, including New York. I won with women by vast, vast majorities. I was way, way up with women far above anybody else in the exit polls of the recent election."
...
Trump, as it turns out, couldn’t be more wrong.
...
Clinton’s 19-point average lead over Trump among women -- if it held all the way to November -- would give her the biggest winning margin among women of any presidential candidate since at least 1980.
...
In fact, looking at a cross-section of April polls, Clinton’s average lead over Trump among female voters is bigger than any nominee has registered in an actual presidential election election in at least 36 years. We rate Trump’s statement Pants on Fire."
http://www.politifact.com/truth-o-meter/statements/2016/may/02/donald-trump/donald-trump-wrong-hillary-clinton-doesnt-do-very-/
Trump Statement B: Says Ted Cruz "said I was in favor in Libya. I never discussed that subject."
"At the GOP debate in Houston, Donald Trump pushed back at a claim from Texas Sen. Ted Cruz that Trump was in favor of the United States helping Libyans oust dictator Muammar Gaddafi.
"He said I was in favor in Libya," Trump said, sounding perplexed. "I never discussed that subject. I was in favor of Libya? We would be so much better off if Gaddafi would be in charge right now."
Oh, Trump discussed it.
And thanks to
BuzzFeed, we have the video. (All the hat tips to
Andrew Kaczynski.)
It comes from 2011, on Trump’s video blog.
"I can’t believe what our country is doing," Trump said, according to a BuzzFeed transcript. "Gaddafi in Libya is killing thousands of people, nobody knows how bad it is, and we’re sitting around we have soldiers all have the Middle East, and we’re not bringing them in to stop this horrible carnage and that’s what it is: It’s a carnage."
Trump continued.
"You talk about things that have happened in history; this could be one of the worst,"
Trump said. "Now we should go in, we should stop this guy, which would be very easy and very quick. We could do it surgically, stop him from doing it, and save these lives. This is absolutely nuts. We don’t want to get involved and you’re gonna end up with something like you’ve never seen before."
And then ...
"But we have go in to save these lives; these people are being slaughtered like animals," Trump said. "It’s horrible what’s going on; it has to be stopped. We should do on a humanitarian basis, immediately go into Libya, knock this guy out very quickly, very surgically, very effectively, and save the lives."
...
Trump tried to claim during the Houston debate that he never discussed supporting U.S. intervention in Libya.
That’s patently inaccurate, as Trump’s own words show. This claim rates Pants on Fire!"
http://www.politifact.com/truth-o-meter/statements/2016/feb/25/donald-trump/donald-trumps-pants-fire-claim-he-never-discussed-/
So yeah, they go through claims pretty thoroughly, and give %'s based on total number of claims rated into each category.