President Donald Trump’s national security team has met to discuss the U.S. response to the Syrian government’s apparent use of chemical weapons on its own people.

White House press secretary Sarah Huckabee Sanders says Vice President Mike Pence chaired the meeting Wednesday afternoon.

She says there have been no decisions yet on whether to strike Syria despite the president’s tweet Wednesday morning threatening to fire “nice and new and ‘smart!'” missiles.

Sanders says the U.S. is confident in laying blame on the Syrian government and its Russian allies for Saturday’s deadly attack in Douma. Opposition activists and rescuers say at least 40 people were killed.

Sanders says, “The president holds Syria and Russia responsible for this chemical weapons attack.”

A Kremlin spokesman has said claims of a chemical weapons attack were fabricated.