Former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in the new afterward for her book "What Happened" writes that it is hard to ignore the "racial subtext of virtually everything [President] Trump says."

"Trump doesn’t even try to pretend he’s a president for all Americans," Clinton writes in excerpts published by The Atlantic on Sunday. "It’s hard to ignore the racial subtext of virtually everything Trump says."

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"Often, it’s not even subtext," she adds, noting Trump's comment widely denounced comment that some immigrants are from “shithole countries."

"None of this is a mark of authenticity or a refreshing break from political correctness," Clinton writes. "Hate speech isn’t 'telling it like it is.' It’s just hate."

The former secretary of State begins the afterward with a denouncement of the Trump administration's "zero tolerance" immigration policy, which resulted in the separation of more than 2,000 migrant children from their parents at the southern border.

"In the roughly 21 months since he took the oath of office, Trump has sunk far below the already-low bar he set for himself in his ugly campaign," Clinton writes. "Exhibit A is the unspeakable cruelty that his administration has inflicted on undocumented families arriving at the border, including separating children, some as young as eight months, from their parents."

Clinton notes data reported by The New York Times that indicates the administration continues to detain 12,800 children.

"Then there’s the president’s monstrous neglect of Puerto Rico," she writes. "After Hurricane Maria ravaged the island, his administration barely responded."

"Some 3,000 Americans died. Now Trump flatly denies those deaths were caused by the storm," she writes, referencing Trump's pair of tweets last week casting doubt on the official death toll from Hurricane Maria.

"I don’t know whether Trump ignores the suffering of Puerto Ricans because he doesn’t know that they’re American citizens, because he assumes people with brown skin and Latino last names probably aren’t Trump fans, or because he just doesn’t have the capacity for empathy," she writes.

Clinton also cites studies and newspaper articles to support her claims that Trump has assaulted the rule of law, waged war on "truth and reason" and undermined the "national unity that makes democracy possible."

She identifies Trump as a "symptom" rather than root cause of the democracy "crisis."

"Over many years, our defenses were worn down by a small group of right-wing billionaires—people like the Mercer family and Charles and David Koch—who spent a lot of time and money building an alternative reality where science is denied, lies masquerade as truth, and paranoia flourishes," Clinton writes.

She concludes with a call to arms for those who share her concerns.

"Democracy may be our birthright as Americans, but it’s not something we can ever take for granted," Clinton writes. "Every generation has to fight for it, has to push us closer to that more perfect union. That time has come again."

The paperback edition of Clinton's book, which includes the new afterward, is set to be released on Tuesday.