The sources claim that the White House has read the document and offered feedback but won't throw its weight around in public. Reuters believe that the move is largely political since a looming election and intransigent leadership means the bill is likely to remain on ice. A report from The Hill in January points out that Feinstein and Burr rejected calls to ignore a proposed national commission to research better solutions. Presumably they thought that trying to look for coherent solutions was too much effort when a jerk of the knee is so much easier.