Graham: Trump, Carson 'not ready to be commander in chief'
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Sen. Lindsey GrahamLindsey Olin GrahamBernie Sanders to Trump: Firing Mueller 'an impeachable offense' The Memo: Lawyer’s exit signals harder line by Trump Senators introduced revised version of election cyber bill MORE (R-S.C.) on Wednesday slammed GOP front-runners Donald TrumpDonald John TrumpScarborough mocks 'Deflection Don' over transgender troop ban Pelosi condemns Trump's 'cowardly, disgusting' ban on transgender troops Trump moves to ban most transgender people from serving in military MORE and Ben Carson, charging that the two political outsider candidates aren't "ready to be commander in chief."

The GOP defense hawk who is in last place in the Republican presidential race, appeared in an interview with George Stephanopoulos on ABC News’ digital live stream and blasted both candidates and their approach to foreign policy.

“I think what Mr. Trump is saying about Syria makes absolutely no sense," said Graham, who served as a judge advocate general in the United States Air Force. 

“Dr. Carson’s a fine man, but he said he would declare energy independence after 9/11," Graham said of the retired neurosurgeon. That’s not going to hold under scrutiny.” 

“It’s just a matter of time until the weight of this event collapses Mr. Trump and Mr. Carson because they’re not ready to be commander in chief,” Graham said.

Still, real estate mogul Trump and Carson are at the top of national polls with almost 25 percent support among Republicans polled, while Graham is 14th, with zero percent support, according to the RealClearPolitics average of polls. 

Graham said he wants to step up the ground component in the fight against ISIS, saying that an army would most likely consist of about 100,000, but "about 10 percent of it needs to come from us." 

“The ground component this time would be mostly regional armies, but we’d have to be part of it,” Graham said,. 

“We can debate whether or not it was smart to go in Iraq, but I can tell you ISIL wants to hit us,” Graham continued. “They hit Paris, they’re coming here.” 

But Graham sought to quell fears that America wouldn’t be engaging in another long-term war, later adding that “I don’t want endless war, but I want real security.” 

“I’ll tell the American people we have two choices: fight ISIL in their backyard or our backyard,” Graham said.

Graham said earlier Wednesday that he’ll introduce legislation that he’ll authorize war against ISIS.

“I’m going to introduce an authorization to use military force against ISIL that is not limited by time, geography or means," Graham said. "We only have two choices regarding ISIL — fight them in their backyard or fight them in ours. I choose to fight them in their backyard.”