Hours after dozens of people were mowed down by a truck in France Thursday night, former Secretary of State Hillary Clinton called for the U.S. to enhance its fight against the Islamic State.

Fox News host Bill O’Reilly asked the presumptive Democratic nominee if she would support French President Francois Hollande should he choose to invoke Article 5 of NATO to declare war on the Islamic State as a result of three major terrorist attacks in his country over the past 18 months.