Homeland Security Secretary John Kelly said Friday that the threat of terrorism is so worrisome that most Americans would “never leave the house” if they knew what he knows about the issue.

“I was telling [Fox News host] Steve [Doocy] on the way in here: If he knew what I knew about terrorism, he’d never leave the house in the morning,” Kelly said during an appearance on Fox News’ “Fox & Friends.”

The Homeland Security chief offered his bold remarks following the four Islamic State-linked terrorist attacks that have happened this week — in England, Egypt, the Philippines, and Indonesia. Those attacks, Kelly said, were carried out “by generally the same groups.”

“It’s nonstop,” he told the Fox News hosts. “The good news is, for us in America, we have amazing people protecting us every day — DHS, obviously, FBI — fighting the away game is [the Department of Defense], CIA, NSA, working with these incredible allies we have around the world.”

Kelly’s comments came the same day it was reported that 26 Coptic Christians in Egypt were murdered by masked militants. The assault also left 25 people wounded.

On Monday, the Islamic State claimed responsibility for an attack in Manchester, England, after an Ariana Grande concert. That attack left 22 dead and more than 100 injured.

Despite the attack in Manchester, U.K. Prime Minister Theresa May insisted “our way of life will prevail.”

“It can happen almost here any time,” Kelly warned. “[B]ut the good news is, again, we have the finest men and women in uniform, out of uniform, police officers, local law enforcement, New York City cops, protecting us.”

Kelly also responded to former President Barack Obama’s slight against President Donald Trump’s administration Thursday, when he said the U.S. cannot “hide behind a wall” to shield itself from the atrocities happening around the word.

The U.S., Kelly said, is doing no such thing.

“We’re not hiding behind a wall,” he said. “We’re constructing a physical barrier, backed up by technology and, of course, the great men and women of Customs and Border Protection to simply safeguard our southern border.”

“It’s not going to impede in any way the legal crossing of millions of people a week — Mexicans and all other nationalities, Americans going south and north," Kelly said. "Normal commercial traffic will move. But we’re not hiding behind a wall and you can’t defend anything by hiding behind something.”