Donald Trump went there in his inauguration speech.
With three words, Trump used his moment in the national spotlight to pledge an end to "radical Islamic terrorism" - a phrase President Barack Obama declined to say during his eight-year tenure.
Trump said his administration would eradicate the threat "from the face of the earth."
The father of Orlando massacre suspect Omar Mateen is an Afghan television personality who holds strong political views, including support for the Afghan Taliban.
Seddique Mateen, who has also been referred to as Mir Seddique in news reports, hosts the Durand Jirga Show on a television channel called Payam-e Afghan, which broadcasts from California. In it, the elder Mateen speaks in the Dari language on a variety of political subjects.
Dozens of videos are posted on a channel under Seddique Mateen's name on YouTube. A phone number and post office box that are displayed on the show were traced back to the Mateen home in Florida. Mateen also owns a religious nonprofit organization under the name Durand Jirga, which is registered in Port St. Lucie, Fla.
Top U.S. counterterrorism officials say they worry a potential terrorist could be hiding among refugees who are looking to come to the United States after escaping the brutal war in Syria.
"It's clearly a population of concern," the director of the National Counterterrorism Center, Nicholas Rasmussen, told the House Homeland Security Committee on Wednesday.
Committee Chairman Mike McCaul, R-Texas, went further, saying it would be a "huge mistake" to bring refugees from the conflict to the U.S. - even as an estimated 4 million children, women and men have been forced to flee Syria and another 7 million have been displaced from their homes there, unable to leave.
Islamic State warned in a new video on Monday that countries taking part in air strikes against Syria would suffer the same fate as France, and threatened to attack in Washington.
The video, which appeared on a site used by Islamic State to post its messages, begins with news footage of the aftermath of Friday's Paris shootings in which at least 129 people were killed.
The message to countries involved in what it called the "crusader campaign" was delivered by a man dressed in fatigues and a turban, and identified in subtitles as Al Ghareeb the Algerian.
While Obama and top officials in his administration referred to the Paris attack Wednesday as terrorism, they generally did not use the term Islamic terrorism.
But Steve Emerson, director of the Investigative Project on Terrorism, criticized officials for avoiding the term.
"The bottom line here, these are Islamic terrorist attacks and need to be called as such," he told Fox News on Wednesday.