“He just cannot follow through,” Corker told CNN. “He cannot speak to the nation as a commander in chief. He cannot speak to the world as a commander in chief. He just cannot do it. And I don't know what it is.”

While the White House spokesman insisted he was “not going to respond specifically to any individual,” he said that Obama has "been very clear about the need to respond" to the Assad regime's alleged chemical weapons use in Syria.

He defended Obama’s shift on Syria, saying people “appreciate a commander in chief who takes in new information and doesn't celebrate decisiveness for the sake of decisiveness."

The White House spokesman added that it was “somewhat ironic when some members of Congress are critical after having asked the president to ask Congress for authorization.”

The White House has also argued that Obama’s call for action is the reason Syria has admitted to having chemical weapons and offered to give them up.