From Bearing Arms:

The chairman of the Senate Banking Committee warned the banking industry on Thursday that it should not attempt to restrict legal gun sales by denying financial services to members of the gun industry.
Sen. Mike Crapo (R., Idaho) sent a letter to eight of the country’s biggest banks detailing his concerns with the way some of them had begun rejecting business from certain gun companies. In the last year, several of them have attempted to restrict what kinds of guns can be sold to the public and who they can be sold to by applying financial pressure.