President Donald Trump, while speaking at a news conference on Wednesday, said the chemical attack against Syrian civilians "crossed a lot of lines for me" and changed the way he views Syria and leader Bashar al-Assad.

"I now have responsibility, and I will have that responsibility and carry it very proudly," Trump said responding to a question about a White House statement Tuesday that blamed the attack in part on President Barack Obama.

"It is now my responsibility. It was a great opportunity missed," Trump said.

Trump did maintain that Obama's failure to respond to his red line threat "was a blank threat (that) set us back a long ways, not only in Syria but in many other parts of the world."

"Yesterday's chemical attack, a chemical attack that was so horrific in Syria against innocent people, including women, small children and even beautiful little babies, their deaths were an affront to humanity," Trump said from the Rose Garden. "These heinous actions by the Assad regime cannot be tolerated. The United States stands with our allies across the globe to condemn this horrific attack and all other horrific attacks, for that matter." President Trump said.