"There's absolutely no evidence to suggest that it's anything but authentic. It's his signature. Sheila Lowe knows a few things about analyzing signatures. She's been a court-qualified document analyst for more than 40 years and has studied Trump's signature since the 1990s. So she's familiar with the tiny variations of how he signs his name. The thing about signatures is that nobody signs their name exactly the same way twice. It's impossible. So everybody has a range of variation and some people have a very wide range and some people have a very narrow range and anything in between. Trump's signature is fairly consistent over time. I mean, it's quite consistent, more than fairly. Some of my colleagues were complaining about the long ending stroke on the birthday card and they said, he doesn't sign that way. But I found one signature in particular in 1987 where he does make that very long final stroke, which means that it is in his range of variation. And then I found another one that had a long stroke but not as long. So those were important similarities. The other things such as the extreme angularity, the compression, it's squeezed like an accordion. And just the fact that it's written naturally, there's no signs of hesitation. And it's very, very difficult to simulate somebody else's signature. So to do that, it's like painting by numbers. You know, you have to, you do a few, a stroke and then you stop and you readjust the paper or the pen. There wasn't any sign of that sort of thing. That's his signature. I had no question about it. So people's signature can change over time. It may or may not, according to health and age and all kinds of factors. But at that time, that is very consistent with his signature."