After Monica Crowley bowed out of a White House position due to plagiarism charges, a man named Michael Anton was given the job, as senior director of strategic communications at the National Security Council.

But past writings may haunt Anton too, as the Weekly Standard uncovered that he wrote a number of essays through the 2016 campaign cycle using the pen name Publius Decius Mus.

Publius argued that Islam is 'incompatible with West.' He defended President Donald Trump's anti-immigrant stances, while suggesting diversity creates 'weakness, tension and disunion.'

When Trump decided to use the slogan 'America First,' Publius said the members of the 'America First Committee' – some of whom were anti-Semites – who argued against the U.S. going to war against Nazi Germany were 'unfairly maligned.'

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Michael Anton (center), the senior director of strategic communications at the National Security Council, wrote a series of essays under a pen name last year

The most well-known piece penned by Publius Decius Mus – the name of a Roman consul who rode ahead of his men and sacrificed himself in battle – was titled 'The Flight 93 Election,' referring to the fourth hijacked plane on Sept. 11, which passengers wrangled back from the terrorists before crashing it in a field in Western Pennsylvania.

In the essay, which the New Yorker called the 'most cogent' case for Trump, Publius likened the election of the businessman to the passengers charging the cockpit 'the consequences were possibly dire, but the consequences of inaction were surely so.'

Anton lambasted what he called 'house-broken conservatives,' who are OK with the status quo, as they 'spend at least several hundred million dollars a year on think-tanks, magazines, conferences, fellowships, and such, complaining about this, that, the other, and everything.'

All this while the country drags leftward.

Trump, he argued in the essay that appeared in the Claremont Review of Books in September 2016, was the only one of the Republican candidates willing to disrupt this conservative business-as-usual.

'Trump, alone among candidates for high office in this or in the last seven (at least) cycles, has stood up to say, I want to live. I want my party to live. I want my country to live. I want my people to live. I want to end the insanity,' Anton wrote.

He also argued that Trump's positioning on the issues of immigration, trade and war were correct.

Conservatives like Ross Douthat of the New York Times responded by suggesting that Publius was downplaying the fact that Trump's election could damage both the country and the conservative movement.

'I’d rather risk defeat at my enemies’ hands than turn my own cause over to a incompetent tyrant,' Douthat wrote.

Other essays written by Publius were more out of the mainstream.

The Huffington Post found an essay Publius published in March, headlined 'Toward a Sensible, Coherent Trumpism,' in which the writer spends 1,000 words defending the original 'America First committee' suggesting it represents only 'an alleged stain on America’s past.'

Anton had frank feelings about immigration and diversity, suggesting the country was not a 'nation as immigrants,' as it's often described, but a 'nation of settlers, who later chose to admit immigrants, and later still not to, and who may justly open or close our doors solely at our own discretion, without deference to forced pieties.'

Diversity, he said, was not the nation's 'strength.'

And Islam, he argued, was not a 'religion of peace.'

'It's a militant faith that exalts conversion by the sworn and inspires thousands to acts of terror – and millions more to support and sympathize with terror,' Anton wrote.

In the piece, Anton both acknowledged that Trump may have gone too far calling for a widespread Muslim ban, as the candidate did in the aftermath of the San Bernardino terror attack, but also praised the Republican for his efforts to limit Muslims coming into the United States.

'Islam and the modern West are incompatible,' he wrote. 'Only an insane society, or one desperate to prove its fidelity to some chimerical "virtue," would have increased Muslim immigration after the September 11 attacks.'

'Yet that is exactly what the United States did,' Anton continued. 'Trump has, for the first time, finally forced the questions" Why? And can we stop now?'

Anton has worked for a number of bold-faced names on the right.

He worked as a speechwriter and press secretary under New York City Mayor Rudy Giuliani, one of Trump's top surrogates.

From there he went to work at President George W. Bush's White House in 2001, as a communications aide for the National Security Council.

That job was made even bigger by the Sept. 11, 2001 terror attacks, the Weekly Standard pointed out.

Anton was among those making the case for war against Iraq, with his team responsible for Bush's line in the president's 2003 State of the Union address, 'The British government has learned that Saddam Hussein recently sought significant quantities of uranium from Africa.'

That intelligence was later proven as false, but the United States indeed went to war with Iraq.

From the White House, Anton worked as a speechwriter for media mogul Rupert Murdoch under the News Corp umbrella, before working at Citigroup and the investment firm BlackRock.

He entered the Trump White House and was outed by the Weekly Standard last week.