President Trump said on Thursday that Defense Secretary Jim Mattis will hold a "major" press conference next week to talk about the fight against the Islamic State.

During an interview with NBC News' Lester Holt, Trump was asked about the war in Afghanistan. His response focused on ISIS.

"I will say this, most importantly, we are making incredible strides against ISIS and next week [Defense Secretary] Gen. Mattis and my generals are going to be having a major news conference to inform the public and the world how well we've done against ISIS," he said.

"We have done really well," Trump added.

The Pentagon has requested additional U.S. troops in Afghanistan.

The Trump administration is reportedly looking to send up to 5,000 more U.S. troops to Afghanistan to combat the Taliban. There are already at least 8,400 U.S. troops in that country.

Mattis said earlier this week that ISIS had already lost a large amount of territory that it once held in Iraq and Syria and hinted that the U.S.-led coalition against the group will soon intensify.

"We will further accelerate this fight to free people from ISIS' crushing occupation and [the] enemy's terror threat to Europe and beyond," Mattis said during a joint press conference in Copenhagen, Denmark, with that country's Defense Minister Claus Hjort Frederiksen.