FBI Special Agent in Charge Eric Smith said the suspect represented a threat the agency faces every day.
"I worry that it sends a strong message to our adversaries out there, particularly Russia and China, that there are huge gaps remaining in the national security decision-making apparatus in this country," John Kirby said.
The 21-year-old was charged with five counts of premeditated homicide on Thursday.
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The interrogation of a former ISIS worker has shed light on the militant group's chemical weapons ambitions.
"The irony is that defeating the Islamic State is what the president said from the beginning was his goal," wrote McGurk, a diplomat who served in the Trump administration.
"The retreat from Syria announced by our American friends cannot make us deviate from our strategic objective—eradicating Daesh," the French president said.
Paul said the president believes "we've been at war too long and in too many places."
Around 1 billion people currently go hungry, but about 2 billion people are overeating, The Lancet commission showed.
"The caliphate has crumbled and ISIS has been defeated," the vice president said hours after the apparent suicide attack.
A man of incredible resolve, in the brig my brother actually uttered the words: "It may have been better if they killed me over there. At least I knew who the enemy was."