Matthew Levitt is the Fromer-Wexler Fellow and Director of the Stein Program on Counterterrorism & Intelligence at The Washington Institute for Near East Policy. He is the author of Hezbollah: The Global Footprint of Lebanon's Party of God.
Fighters with the Lebanese Shiite Hezbollah party, carry flags as they parade in a southern suburb of the capital Beirut, to mark the al-Quds (Jerusalem) International Day, on May 31.
FBI agents collect evidence at a FedEx Office facility following an explosion at a nearby sorting center on March 20, in Sunset Valley, Texas. (Scott Olson/Getty Images)
A general view taken on June 11, 2017 shows portraits of Qatar's Emir Sheikh Tamim bin Hamad Al-Thani on the back of vehicles and text reading in Arabic: "Tamim the glorious" in Doha after the diplomatic crisis surrounding Qatar and the other Gulf countries spilled from social media to more traditional forms of media -- all the way back to billboards.
The diplomatic crisis surrounding Qatar and other Gulf countries has remained a peaceful one for now, but open warfare has been declared in the media -- both traditional and social. / AFP PHOTO / KARIM JAAFAR (Photo credit should read KARIM JAAFAR/AFP/Getty Images)
A general view taken on June 11, 2017 shows portraits of Qatar's Emir Sheikh Tamim bin Hamad Al-Thani on the back of vehicles and text reading in Arabic: "Tamim the glorious" in Doha after the diplomatic crisis surrounding Qatar and the other Gulf countries spilled from social media to more traditional forms of media -- all the way back to billboards.
The diplomatic crisis surrounding Qatar and other Gulf countries has remained a peaceful one for now, but open warfare has been declared in the media -- both traditional and social. / AFP PHOTO / KARIM JAAFAR (Photo credit should read KARIM JAAFAR/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 18: Law enforcement officials work at the scene of Saturday night's explosion in the Chelsea neighborhood of Manhattan, September 18, 2016 in New York City. Following the explosion, Mayor Bill de Blasio has promised a 'substantial' police presence throughout the week. New York Governor Andrew Cuomo also said an additional 1,000 New York State and National Guard troops will patrol transit stations and airports as a precaution. (Photo by Drew Angerer/Getty Images)
TOPSHOT - Passengers evacuate the Brussels Airport, in Zaventem, on March 22, 2016, after a string of explosions rocked Brussels airport and a city metro station, killing at least 26 people in apparently coordinated attacks, officials said.
European countries on Tuesday vowed to defend democracy against terrorism after blasts at Brussels airport and in the EU's institutional heart left at least 26 dead and dozens injured. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read )
An Iranian woman walks past a giant poster showing supreme leader, Ayatollah Ali Khamenei (R) and the founder of Iran's Islamic Republic, Ayatollah Ruhollah Khomeini (L) during a ceremony marking the 36th anniversary of his return from exile on February 1, 2015 at Khomeini's mausoleum in a suburb of Tehran. Khomeini returned from exile in 1979, the trigger for a revolution which spawned an Islamic state now engulfed in a deep political crisis. AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)
