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There were 61 speeches delivered on Day 1 of the DNC in Philadelphia on Monday, but one topic was noticeably absent. 

Many observers noted on social media that there was not one mention of ISIS, a striking contrast between the Dem gathering and last week's GOP convention in Cleveland. 

The addresses, including primetime appearances by Michelle Obama, Elizabeth Warren and Bernie Sanders, were heavy on blistering attacks on Donald Trump.

Meantime, this morning near Normandy, France, two knife-wielding attackers slit the throat of an 84-year-old priest and critically wounded at least one other person. 

The attack on the Catholic church was carried out by two men who shouted "Allahu Akbar," and reportedly pledged allegiance to ISIS. They were shot dead by police.

"[ISIS] has declared war on us," French President Francois Hollande said Tuesday. "We must fight this war by all means, while respecting the rule of law -- what makes us a democracy."

Former U.N. Ambassador John Bolton discussed the attack in the clip above, saying if these attacks in Europe are not stopped, he believes locals will begin fighting back on their own. 

"If responsible public leaders don't protect the people, the people will protect themselves."

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Donald Trump called out the Democrat speakers for ignoring ISIS and terrorism on Day 1 of the convention. 

"They don't want to talk about [ISIS]. Because in a very true way, they really established ISIS because of weakness," he said in a speech to the VFW in Charlotte.