Donald Trump’s plan to defeat the Islamic State involves destroying them — and their families.

“I would knock the hell out of ISIS, I would hit them so hard,” Trump said on “Fox & Friends” on Wednesday. “When you get these terrorists, you have to take out their families. They care about their lives, don’t kid yourself. When they say they don’t care about their lives, you have to take out their families.”

Trump’s comments came a day after the Lebanese government released Saja al-Dulaimi, the former wife of ISIS chief Abu Bakr al-Baghdadi, as part of a prisoner swap with an al-Qaida affiliate. But there was “no immediate indication that Dulaimi’s release was for the benefit of ISIS,” CNN reported. (She has been divorced from Baghdadi for more than six years and told Al Jazeera she hopes to resettle in Turkey.)

Meanwhile, the Republican frontrunner is attacking President Obama on ISIS, releasing a new campaign video critical of the administration’s response to the ongoing terror threat.

The video, released via Trump’s Instagram account on Tuesday, uses footage of a smiling Obama posing for selfies during a BuzzFeed photo shoot in February juxtaposed with images of ISIS training camps, the recent terror attacks in Paris and the downing of a Russian airliner.

“It is time for serious leadership,” reads an overlay before Trump’s campaign slogan “Make America Great Again” appears.

According to a new Quinnipiac national poll released Wednesday, Trump is seen as best equipped among GOP candidates to handle terrorism, with 29 percent of Republican and Republican-leaning voters holding that view. Ben Carson, at 19 percent, is viewed as the second-best candidate when it comes to dealing with global terror, the poll found.

“I say ISIS is our No. 1 threat,” Trump said on “Fox & Friends” Wednesday. “And we have a president that doesn’t know what he is doing. And all he’s worried about is climate change.”