Sen. John McCain (R-Ariz.) panned President Obama's statement Friday that a "line has been crossed" but that "direct evidence" is still needed to verify Syria's chemical weapons attack.

Earlier on Friday, Obama at the White House, speaking next to King Abdullah of Jordan, said the United States, as well as a number of other countries, is currently in the process of confirming reports of Syria's chemical weapons attack against rebels in the country.

"Knowing that there's chemical weapons in Syria doesn't tell us when they were used or how they were used," Obama said. "We ourselves will be putting a lot of resources on this."