Donald Trump
Donald TrumpReuters

U.S. Donald Trump on Thursday said that Washington “would be extremely upset” if Syrian President Bashar Al-Assad uses chemical weapons again.

Speaking at a press conference with Kuwaiti Emir Sheikh Sabah al-Ahmad Al-Sabah, Trump responded to a question about a UN report released this week alleging that Syrian President Bashar Al-Assad's government had used chemical weapons 27 times during the civil war, including using sarin in an April 4 attack on the town of Khan Sheikhun.

"I find it hard to believe that after what we did the last time that Assad would do it again," Trump said. "But nothing would change, we would be extremely upset if he was using chemical weapons."

Following the deadly chemical weapons attack in April, Trump ordered an attack on a Syrian airbase using 59 Tomahawk missiles.

At the same time, Trump clarified on Thursday that "we have very little to do with Syria other than killing ISIS."

"As far as Syria is concerned, we have very little to do with Syria other than killing ISIS," Trump said Thursday. "What we do is we kill ISIS, and we have succeeded in that respect. We have done better in eight months of my presidency in the previous eight years against ISIS. So ISIS is rapidly disappearing as you know, and that's because of our great military."

Assad has denied using chemical weapons and has even claimed that the Khan Sheikhun attack was fabricated by the United States.

The Organization for the Prohibition of Chemical Weapons (OPCW) has in the past determined that civilians in Syria may have been exposed to chemicals even after the Syrian government agreed to a 2013 deal, brokered by the U.S. and Russia, to surrender its chemical weapons.