Off the top of my head, Trump has claimed his Air Force One is bigger than others, his nuclear button is bigger than North Korea's, his penis is bigger than Marco Rubio's, his crowds are bigger than anyone else's, killing al-Baghdadi raid was bigger than killing Bin Ladin, he's currently going through the "greatest witch hunt in American history," his tax cuts were the biggest in American history, the economy is the greatest in American history, his trade deal with China was the biggest and greatest ever for farmers, he has accomplished more than any other president in his first term, The Apprentice was the number one show on TV, and many more.

Some of those are true. Some can be called true with mental gymnastics. A lot aren't though, and he keeps claiming everything he's involved in is the biggest, best, or worst.

Edit: A letter.