As Sunday marks 90 days since the US launched its military actions in Libya, the debate on the intervention is coming to a head.

American engagements in hostilities that surpass 90 days must be authorized by the country's Congress, the 1973 War Powers Resolution says.

However, the White House does not reckon it is necessary to do so, as as its spokesman Jay Carney explained on Friday.

"We do not believe, as a legal matter, that our engagement in this mission meets the hostilities threshold set by the War Powers Resolution, and therefore does not apply," he said, as cited by NPR.

"We are participants in the NATO mission," said Carney. "NATO has extended the mission to continue to fulfill the goals set forward by United Nations Security Council Resolution 1973, and we continue to participate in it," Carney declared.

However, bipartisan lawmakers filed a lawsuit against President Barack Obama Wednesday, stating he started a war without Congressional authorization.