Call it the mystery provision.
A small section in the House Republicans' big bill to implement the 9/11 Commission's recommendations would make it easier for the president to exclude unions from representing "homeland security" employees.
But no one seems to know where the proposal came from or why it is needed.
The proposal, which had been kept secret while House Republican leaders devised their bill, was spotted by the National Treasury Employees Union shortly after GOP leaders began distributing their legislation late Friday. House committees will take up the bill for debate and amendment this week.