Conservative author Ann Coulter is such a fervent supporter of Donald Trump that she wrote a book, released this week, called "In Trump We Trust."
In the book, she wrote that there was only one thing the Republican nominee could do that would be unforgivable. And he already did it this week.
"There's nothing Trump can do that won't be forgiven," Coulter wrote. "Except change his immigration policies."
Photos of Ann Coulter through the years
Ann Coulter through the years
Ann Coulter through the years
**FILE**Controversial political commentator Ann Coulter poses in New York's Central Park, Aug. 11, 2003. (AP Photo/Jim Cooper, File)
In this photo provided by StarPix, Bill Maher and Ann Coulter take part in Radio City Music Hall's speaker series titled "The Minds That Move The World" Monday, March 9, 2009 in New York. This was the first of three Speaker Series events featuring prominent political figures discussing the most current events of our day. (AP Photo/Marion Curtis, StarPix)
Ann Coulter appears at a book signing at the Conservative Political Action Conference (CPAC), in Washington, Friday, Feb. 19, 2010. (AP Photo/Cliff Owen)
Jimmie Walker and Ann Coulter during 5th Annual TV Land Awards - Arrivals at Barker Hanger in Santa Monica, CA, United States. (Photo by Barry King/WireImage)
Conservative author Ann Coulter addresses the Conservative Political Action Conference (CPAC) in Washington on Saturday Feb. 20,2010. (AP Photo/Jose Luis Magana)
FILE - This Feb. 10, 2012 file photo shows conservative commentator Ann Coulter gesturing while speaking at the Conservative Political Action Conference (CPAC) in Washington. The Fox Nation web site has removed a column by conservative commentator Ann Coulter because it had a reference to killing the daughter of Sen. John McCain. Fox said Thursday, April 11, 2013, the column, posted Wednesday night, was deemed offensive. Coulter wrote that MSNBC's Martin Bashir suggested Republican senators need to have a member of their family killed before they would support stronger gun control legislation. She wrote: âLet's start with Meghan McCain!â (AP Photo/J. Scott Applewhite, file)
Journalist Ann Coulter attends the Time 100 Gala, celebrating the 100 most influential people in the world, on Tuesday, April 26, 2011, in New York. (AP Photo/Peter Kramer)
Lou Ferrigno, left, and Ann Coulter attend the "Sharknado 3: Oh Hell No!" premiere at iPic Theaters Westwood on Wednesday, July 22, 2015 in Los Angeles. (Photo by Paul A. Hebert/Invision/AP)
BEVERLY HILLS, CA - JULY 15: Political Commentator Ann Coulter and actor Evan Henzi attend AN OPEN SECRET Los Angeles Premiere on July 15, 2015 in Beverly Hills, California. (Photo by Michael Bezjian/Getty Images for Platform Media Group)
Author Ann Coulter speaks during an address to the 39th Conservative Political Action Committee February 10, 2012 in Washington, DC. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
WASHINGTON, DC - OCTOBER 23: Ann Coulter, left, is interviewed for One America News Network on Wednesday October 23, 2013 in Washington, DC. Coulter is promoting her new book, 'Never Trust a Liberal Over 3-Especially a Republican'. (Photo by Matt McClain/ The Washington Post via Getty Images)
LOS ANGELES, CA - JULY 22: Political commentator and author Ann Coulter arrives at the premiere of 'Sharknado 3: Oh Hell No!' at iPic Theaters on July 22, 2015 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
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Over the past several days, Trump has moved to significantly moderate his hard-line immigration policies.
"No citizenship," he said in a Wednesday interview with Fox News' Sean Hannity on Wednesday:
"Let me go a step further — they'll pay back taxes, they have to pay taxes, there's no amnesty, as such, there's no amnesty, but we work with them ... I meet thousands and thousands of people on this subject, and I've had very strong people come up to me, really great, great people come up to me, and they've said, 'Mr. Trump, I love you, but to take a person who's been here for 15 or 20 years and throw them and their family out, it's so tough, Mr. Trump.' I have it all the time! It's a very, very hard thing."
Coulter mocked Trump on Twitter after the Hannity interview for suggesting that it would be too hard to deport 11 million people:
Well, if it's "hard," then nevermind. Trump: "... to take a person who's been here for 15 or 20 years ....It's a very, very hard thing."
Immigration has been a central issue in Trump's campaign, and his tough stance on the issue helped him secure the Republican nomination. He has faced criticism this week from some of those whose plans he attacked in the Republican primary campaign.