A bipartisan group of senators is on the verge of a deal that would expand background checks to all private firearms sales with limited exemptions, but significant disagreements remain on the issue of keeping records of private gun sales, according to aides familiar with the talks…

Democrats say that keeping records of private sales is necessary to enforce any new law and because current federal law requires licensed firearm dealers to keep records. Records of private sales also would help law enforcement trace back the history of a gun used in a crime, according to Democratic aides. Republicans, however, believe that records of private sales could put an undue burden on gun owners or could be perceived by gun rights advocates as a precursor to a national gun registry…

More Republican support is anticipated in part because the four senators involved in the talks have agreed that any new background check program would exempt private transactions between family members or people who completed a background check in order to obtain a concealed-carry permit, according to aides.