NEW YORK (

TheStreet

) -- President Barack Obama said NATO was considering a range of military options in response to the crisis in Libya.

On Monday, Obama repeated that the mounting violence being used by the Libyan government against its civilians was unacceptable and that he has authorized millions of dollars in humanitarian aid.

He met with Australian Prime Minister Julia Gillard in the White House on Monday to discuss the global situation, after which he spoke to reporters briefly.

He said NATO is consulting "around a wide range of potential options, including potential military options, in response to the violence that continues to take place inside of Libya."

NATO Secretary General Anders Fogh Rasmussen has said the 28-nation alliance has "no intention to intervene" in the uprising in Libya "if not requested." On Monday, however, he stated that the alliance is conducting "prudent planning for any eventuality."

Rasmussen said that if embattled leader Moammar Gadhafi continues to support "systematic" attacks on the Libyan people, it will be difficult for the United Nations and the global community to "stand idly by."

He said NATO was looking at a number of options, including the possibility of a no-fly zone.

Several global governments have warned against the complexity of imposing a no-fly zone and believe that any military action enacted by the alliance would require a U.N. resolution.

"Let me stress that the U.N. Security Council resolution as it stands does not authorize the use of armed forces," Rasmussen said. "A no-fly zone would definitely require a U.N. Security Council resolution."

As the situation in Libya becomes increasingly uncertain, the U.N. says that over a million people fleeing the country are in need of humanitarian aid.

"Humanitarian organizations need urgent access now," U.N. aid coordinator Valerie Amos said. "People are injured and dying and need help immediately."

However, the U.N. has remained reluctant to get involved.

"I call on the authorities to provide access without delay to allow aid workers to help save lives," Amos said in a statement. "I would also remind all concerned to ensure that civilians are protected from harm."

--Written by Theresa McCabe in Boston.

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