Tucker Carlson welcomed David Garrow to his show Monday night, and the guest had some wild revelations about former President Barack Obama.

Garrow is a progressive Democrat who recently published a book called “Rising Star” which is an exhaustive look at Obama’s life before he became president.

Carlson started the segment by saying “you found material in this book not previously uncovered during [Obama’s] entire presidency [and] his years in the Senate.. Why did it take you so long to find this?”

Garrow explains what he found — and why, even as a progressive Democrat, he is “disturbed” by Obama’s secrets and change over the years.