Barack Obama, the US president, is due to announce additional airline security measures following the attempted bombing of a US-bound plane on Christmas Day.
Obama planned to unveil the changes later on Tuesday, after meeting US intelligence chiefs and security advisers.
Administration officials said the proposed reforms - aimed at thwarting any possible future attacks - include overhauling the much-criticised airline watchlist system.
The White House is on the defensive after Umar Farouk Abdulmutallab, accused of trying to blow up a US plane, was allowed to board in Amsterdam despite the fact that US intelligence agencies and the state department had information on him.
Hillary Clinton, the secretary of state, Robert Gates, the defence secretary, Leon Panetta, head of the CIA, Robert Mueller, director of the FBI, and Janet Napolitano, homeland security secretary, were among the administration heads due to meet the president on Tuesday to discuss the situation.
Obama, just back from an 11-day winter holiday in Hawaii, is facing scathing criticism from Republican politicians, who say he is weak on national security issues.
A White House spokesman insisted the renewed security concerns would not keep Obama from addressing rising unemployment in the country, and continuing to push for more healthcare reform.
"When you're president of the United States you've got to be able to walk and chew gum at the same time," Bill Burton, the spokesman, said on Monday.
But with two weeks to go before the one-year mark of his presidency, experts said Obama would be spending more time on national security issues than expected.
The administration on Monday imposed stricter screening regulations for US-bound airline passengers from Yemen, Nigeria and 12 other countries, including possible full-body pat-downs, searches of carry-on bags, and full-body scanning.
But the "enhanced screening" rules got off to a patchy start, amid complaints of delays and discrimination.
Several European governments, including Germany, France and Spain, said they were still studying the rules before implementing them.
With 13 of the 14 nations cited by the US Transportation Security Administration (TSA) being majority Muslim states, the Council on American-Islamic Relations (CAIR), a Muslim civil rights and advocacy organisation, said the procedures amounted to ethnic profiling.
"Under these new guidelines, almost every American Muslim who travels to see family or friends or goes on pilgrimage to Mecca will automatically be singled out for special security checks - that's profiling," Nihad Awad, CAIR's national executive director, said in a statement.