Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - ISIS beheaded another Westerner, a British aid worker. Britain's leader vowed the death won't stop his country from battling the terrorist group. And U.S. Secretary of State John Kerry courted Middle Eastern leaders to join a coalition in the fight.
Following this weekend's traumatic events, world leaders struggled Monday to come up with solutions to combat ISIS at a conference in Paris.
More than two dozen nations, the Arab League, the European Union and United Nations met in the French capital, calling ISIS a threat to the international community and agreeing to "ensure that the culprits are brought to justice."