The US now has "little doubt" the Syrian government used chemical weapons against civilians last week, a senior reporter told Reuters. The Obama administration said a "serious response" would be required should evidence of such an attack emerge.
US Senator John McCain said Washington should take "serious action" against Syria, and suggested launching cruise missiles. Speaking in South Korea, he said:
"We know for sure that he's used them at least once, now here is the second time, horrific, horrific.
"And if the United States stands by, and doesn't take very serious action, not just launching some cruise missiles, then again, our credibility in the world is diminished even more, if there is any left. "
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.