The next book by former Vice President Dick Cheney is aimed directly at President Barack Obama.

Cheney’s “Exceptional: Why the World Needs a Powerful America” will be published Sept. 1 by Threshold Editions, the publisher announced Tuesday. The book, co-authored by Cheney’s daughter Liz Cheney, contends that Obama has abandoned a decades-long tradition of American global leadership. In a statement issued by Threshold, a conservative imprint of Simon & Schuster, the former vice president said Obama had “significantly diminished” U.S. power at a time of a “rapidly growing” terrorist threat.

Cheney, a Republican, has been an emphatic critic of Obama, a Democrat, recently calling him the worst president in his lifetime. Cheney’s previous books include the memoir “In My Time” and “Heart,” about his long battle with cardiac disease.