The FBI currently has investigations, "opened into radical Islamic terrorists in all 50 states," according to the Department of Homeland Security Secretary, John Kelly. He warns the public that the threat of terrorism in the United States has reached an all-time high with radicalized terrorists in the country plotting to strike, "each and every single day."

Kelly disclosed on Tuesday that there have been at least 37, "ISIS-linked plots to attack our country," since 2013, a number that shows no signs of decreasing any time soon with renewed calls for jihad on the U.S.

"We don't know their intentions," Kelly said during an address at George Washington University. "We don't know why they're here or why they're coming. We are completely blind to what they're capable of."

Terrorists continue to embed themselves inside American communities across the country, according to Kelly, who said that in just the past year there have been, "36 homegrown terrorist cases in 18 states."

"We've seen an unprecedented spike in homegrown terrorism," Kelly said. "These are the cases we know about—homegrown terrorism is notoriously difficult to predict and control."

Terrorists in the United States are plotting attacks "every single day," according to Kelly.

Kelly disclosed the problem against radical suicidal terrorists — there is no way to prevent someone from blowing themselves up.

"I tell you, without exaggeration, they try to carry out this mission each and every single day and no one can tell you how to stop it. No one," he said.

The United States, he continued, is "under attack" from a variety of bad actors, including "failed states, cyber-terrorists, vicious smugglers, and sadistic radicals."

"And we are under attack every single day," he said. "The threats are relentless."

America lacks the ability to properly vet individuals when they attempt to enter the country, according to Kelly, who warned that scores of radicalized individuals are trying each day to enter America.

"We don't get to vet them," Kelly said. "We don't know their intentions. We don't know they're here. They slip into our country unnoticed, living among us, and we are completely blind as to what they are capable of."