WASHINGTON (AP) - A key senator says the unveiling of a sweeping immigration bill set for Tuesday could be delayed because of the tragedy at the Boston marathon.
    
Republican Sen. John McCain of Arizona says the roll-out could happen Wednesday instead.
    
The bill would secure the border, remake legal immigration, boost workplace enforcement and put 11 million people here illegally on a path to citizenship.
    
Immigration activists and business and religious leaders had been invited to an event Tuesday to release the bill.
    
It would be the culmination of months of closed-door meetings among four Democrats and four Republicans, including McCain, Sen. Marco Rubio of Florida, and Democrat Chuck Schumer of New York.
    
Their legislation aims to strike a balance between enforcement provisions sought by Republicans, and Democratic priorities, including making citizenship accessible.

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