With so many of President Trump's advisers and appointees making headlines for everything from lying about conversations with Russian officials to promoting Ivanka Trump's clothing line on TV, it can be hard to keep track of all of the concerning people who now have power in the White House.

But a recent profile in The Washington Post highlights someone you might not have heard of before: Sebastian Gorka, a man who in the last year has gone from raising eyebrows — particularly with his views on Islam — on the fringes of Washington, D.C., to holding a lot of power as deputy assistant to President Donald Trump.

Before Gorka was hired to work in the White House, he was the national security editor for Breitbart, a site that has become popular with the "alt-right" (a.k.a. white nationalists). But even though he now advises the president and has written a book called Defeating Jihad, The Washington Post points out that he doesn't speak Arabic, he has never lived in a predominantly Muslim country, and his academic credentials with relation to Islam are lacking.

Some foreign-policy experts also questioned Gorka's expertise in Talking Points Memo. "I’d heard the name once or twice but he’s not a major figure in the field. He’s not someone whose work one needs to know to be conversant in these issues," said Stephen Biddle, an adjunct senior fellow for defense policy at the Council on Foreign Relations and a political science professor at George Washington University.

"He thinks the government and intelligence agencies don’t know anything about radicalization, but the government knows a lot and thinks he’s nuts," Cindy Storer, a former CIA analyst, told The Washington Post.

More concerning than his lack of experience may be his views on Islam and how he denounces the religion as a whole. Talking Points Memo reports that he claimed that allowing Muslim refugees into the country would be "national suicide." And The Washington Post writes that he thinks that a lot of terrorism is rooted in Islam and the "martial" parts of the Koran, which he says might predispose Muslims to acts of terror.

Gorka's rhetoric against the Muslim faith is concerning, and his actions can be chilling. In November, during a fund-raiser after Trump's election, he showed his fans a picture that he "was not meant to show usually" of a dead, supposedly Muslim man pictured next to an AK-47 assault rifle with the purpose of stoking excitement rather than disgust, the The Washington Post reports.

And earlier this month, Gorka wouldn't directly answer an NPR reporter who asked whether or not Trump considers Islam to be a religion. (It is. The second-largest religion in the world, actually.)

In the same series of questions, when asked about recently ousted national security adviser Michael Flynn's comments that Islam is a "cancer" that "hides behind this notion of being a religion," Gorka did try to clarify that Trump's strong language and views were against "radical Islamic terrorism" and not Islam as a whole.

As George W. Bush said after the 9/11 attacks, "The face of terror is not the true faith of Islam. That's not what Islam is all about. Islam is peace."

Related: Muslim People Are Helping Jewish Groups Recover From Threats

Check this out: