The man who police say committed the deadly shooting spree in El Paso, Texas, is believed to have published an anti-immigrant manifesto minutes before the attack.

Law enforcement officials said they were confident that an anti-immigrant screed posted online belongs to Patrick Wood Crusius, 21, who they said is responsible for Saturday’s mass shooting at a Walmart in El Paso—leaving at least 20 dead and 26 wounded or injured.

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The nearly 2,400-word manifesto outlines reasons for launching the attack, breaking down the “political” and “economic” motivations.

The entire diatribe argues that U.S. leaders—both Republicans and Democrats—are guilty of allowing unfettered immigration into the country and that violent action is needed to preserve the white population.

“This attack is a response to the Hispanic invasion of Texas. They are the instigators, not me. I am simply defending my country from cultural and ethnic replacement brought on by an invasion,” the manifesto reads. “[I]t makes no sense to keep on letting millions of illegal or legal immigrants flood into the United States, and to keep the tens of millions that are already here.”

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The screed blames the GOP for being “divided” on the issue of mass immigration, accusing a significant portion of the Republican Party of being sold to corporate interests that want to maintain a steady flow of low-wage migrants into the country.

The document also takes aim at the Democratic Party, accusing it of being essentially universal in its support of welcoming an onslaught of migrants, and saying Democrats’ “pandering” to the Hispanic population will give them dominant control of the U.S. political system in the near future.

“The heavy Hispanic population in Texas will make us a Democrat stronghold. Losing Texas and a few other states with heavy Hispanic population to the Democrats is all it would take for them to win nearly every presidential election,” the manifesto says.

The author expresses explicit support to the shooter in Christchurch, New Zealand, who killed 51 people at a mosque in March. The author also gained inspiration by reading “The Great Replacement,” a book by a white nationalist French author who claims European elites are conspiring to replace their native populations with non-European immigrants.

The manifesto ticks off a number of far-right grievances. However, the author also devotes a significant portion to overpopulation and its contribution to environmental degradation.

“The decimation of the environment is creating a massive burden for future generations. Corporations are heaing [sic] the destruction of our environment by shamelessly over harvesting resources,” it reads, saying Americans are unwilling to change their lifestyle to save the environment.

“Fresh water is being polluted from farming and oil drilling operations. Consumer culture is creating thousands of tons of unnecessary plastic waste and electronic waste, and recycling to help slow this down is almost non-existent.”

The author concludes that the “next logical step” is to decrease the population. “If we can get rid of enough people, then our way of life can become more sustainable,” the manifesto says.

“This is just the beginning of the fight for America and Europe. I am honored to head the fight to reclaim my country from destruction.”

The El Paso police chief said his department believes the manifesto belongs to the shooter. If so, Saturday’s deadly attack likely will be branded as a hate crime.

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