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Gingrich: Defeating Obama is 'a duty of national security'

 TULSA, Okla. -- Newt Gingrich said Monday a Republican win in November is "a duty of national security," taking his attack on President Barack Obama a step further on the day the country celebrates Presidents Day. 

"Defeating Barack Obama becomes, in fact, a duty of national security," Gingrich told a crowd of about 4,000 people on the campus of Oral Roberts University. "Because the fact is, he is incapable of defending the United States." 

Gingrich, who frequently refers to Obama as the "the most dangerous president in modern American history," again said the country is at risk "someday in your lifetime of losing an American city" from a terrorist attack. 

The former House speaker, who wears a pin with the flag of George Washington on his lapel to remind him of the meaning of being commander-in-chief, was especially harsh on the Obama administration’s policies towards Iran and Israel. 

Evan Vucci / AP

Republican presidential candidate Newt Gingrich speaks during a town hall at Oral Roberts University on Monday.

Obama, Gingrich said on his first day in Oklahoma, "wants to unilaterally weaken the United States, he wants to cut the aid to Israel for its anti-ballistic missile defense, he refuses to take Iran seriously."

The rally at ORU started just a couple hours after the White House announced that the Israeli Prime Minister, Benjamin Netanyahu, would meet with Obama early next month. 

Gingrich noted, “No American can second-guess an Israeli prime minister on the matter of survival,” and said his message to the Iranians would be simple. 

"You need to stop your (nuclear) program before you get hit because you should be under no illusions, if you refuse to stop your program, long before it is completed you are going to get hit and we are not in any way going to stop the Israelis from defending themselves,’” he said.