Vice President Biden on Tuesday chuckled at the idea of GOP presidential nominee Donald TrumpDonald John TrumpTed Cruz knocks New York Times for 'stunning' correction on Kavanaugh report US service member killed in Afghanistan Pro-Trump website edited British reality star's picture to show him wearing Trump hat MORE defeating the Islamic State in Iraq and Syria (ISIS).

Biden then explained to ABC News why feels Trump and his running mate, Indiana Gov. Mike PenceMichael (Mike) Richard PenceTrump: House Judiciary should investigate Obama Netflix deal instead of his business Farm manager doubts story horse bit Pence: report Supreme Court comes to Trump's aid on immigration MORE, are not capable of handling terrorist groups such as ISIS.

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“We have the most significant homeland security of any country in the world,” he told ABC News. "We have the finest special forces in the world.

“What are they doing, Pence and Trump?” Biden said from at the Democratic National Convention in Philadelphia. "What they’re doing is breaking up our alliances. These guys don’t know what they’re talking about.”

Trump earlier Tuesday criticized the Democratic Party for failing to mention ISIS during its convention's opening night.

“We need to change our foreign policy to focus defeating and destroying ISIS, a word you didn’t hear last night at the Democrat convention,” he said during a speech to the Veterans of Foreign Wars.

“You didn’t hear about it. They don’t want to talk about it, because in a very true way, they really established ISIS, because of weakness.”

PolitiFact on Tuesday reported that there were zero mentions of the threat posed by ISIS in the 61 speeches during the Democratic convention Monday night.

The first of the event’s four nights focused instead on issues such as immigration, drug addiction and unifying Democrats against Trump.

Biden on Tuesday said it is premature to judge the Democratic response to ISIS before the party’s convention closes.

“That could be, but I mean, there’s a lot more speakers to come,” he said when asked about the convention’s opening night.

Earlier Tuesday, two men stormed a Catholic church in Normandy, France, in the name of ISIS.

Police shot and killed the pair of attackers, but a priest was killed during the incident and one other person was seriously wounded.