Duncan left himself less wiggle room. "This stuff is real," he said last week. "Schools are already starting to give teachers notices."

Asked to provide backup for Duncan's assertion, spokesman Daren Briscoe said it was based on "an unspecified call he was on with unnamed persons," and the secretary might not be comfortable sharing details.

Briscoe referred queries about layoffs to the American Association of School Administrators. Noelle M. Ellerson, an assistant director of the organization, said Monday that in her many discussions with superintendents at the group's just-completed annual meeting, she heard of no layoffs of teachers. While everyone is bracing for that possibility down the road, she said, "not a single one I spoke with had already issued pink slips."

Most school district budgets for the next school year won't be completed for two months, she said, meaning any layoff notices would come in early to mid-May. "No one had yet acted."

As for the assertion that 600,000 women could be dropped from the Women, Infants and Children Program, that's not to say the rolls would be cut by that number. The actual number is likely to include women who are not enrolled in the program now and could be denied when seeking to join it. Federal officials say the true number will depend on how states can manage their caseloads.

Transportation Secretary Ray LaHood has warned of impending furloughs of air traffic controllers, who may need to take one day off every two weeks, and said air-travel delays are likely across the country. Asked Friday why the airline lobby predicted no major impact on air travel from the sequester, he said, "I don't think they have the information we're presenting to them today."

"The idea that we're just doing this to create some kind of a horrific scare tactic is nonsense," LaHood said. But it's a pressure tactic nonetheless: "What I'm trying to do is to wake up members of the Congress on the Republican side to the idea that they need to come to the table."

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