The ghostwriter behind one of Republican presidential nominee Donald Trump‘s most famous books recently said that he will donate all of his 2016 proceeds from that book to immigrant rights organizations.

"I feel a deep sense of remorse that I contributed to presenting Trump in a way that brought him wider attention and made him more appealing than he is," said Tony Schwartz in an article from The New Yorker‘s July 25 issue. Schwartz, who ghostwrote Trump’s best-selling 1987 memoir, "Trump: The Art of the Deal," described his discomfort with Trump’s rise to the Republican nomination—both because of his racist rhetoric and his observation of Trump’s darker personality traits:

Schwartz says of Trump, "He lied strategically. He had a complete lack of conscience about it." Since most people are "constrained by the truth," Trump’s indifference to it "gave him a strange advantage."

When challenged about the facts, Schwartz says, Trump would often double down, repeat himself, and grow belligerent. This quality was recently on display after Trump posted on Twitter a derogatory image of Hillary Clinton that contained a six-pointed star lifted from a white-supremacist Web site. Campaign staffers took the image down, but two days later Trump angrily defended it, insisting that there was no anti-Semitic implication. Whenever "the thin veneer of Trump’s vanity is challenged," Schwartz says, he overreacts—not an ideal quality in a head of state.

The article also details the challenges Schwartz faced while writing the book, as well as his sense of complicity in promoting Trump. He said that he would donate his share of 2016 royalties from the book to a number of immigrant and human rights advocacy organizations, specifically "the National Immigration Law Center, Human Rights Watch, the Center for the Victims of Torture, the National Immigration Forum and the Tahirih Justice Center."

"I’ll carry this until the end of my life," he added. "There’s no righting it. But I like the idea that, the more copies that ‘The Art of the Deal’ sells, the more money I can donate to the people whose rights Trump seeks to abridge."