The White House sent out this email earlier today, announcing that it's close for sequestration:
ATTN Interested Parties,
Due to staffing reductions resulting from sequestration, we regret to inform you that White House Tours will be canceled effective Saturday, March 9, 2013 until further notice. Unfortunately, we will not be able to reschedule affected tours.
We very much regret having to take this action, particularly during the popular Spring touring season. For updates regarding this situation, please contact the White House Visitors Office 24 Hour Hotline at (202) 456-7041.
White House Visitors Office