Sen. Bernie Sanders (I-Vt.) said he would support forcing gun sellers to provide data about purchasers’ criminal records in an effort to curb gun violence.The Vermont senator introduced the bill on Monday, which would require sellers to forward their buyer’s information to the FBI’s National Instant Criminal Background Check System, or NICS, as is already the case.The bill would also require gun dealers who have been the subject of NICS requests to submit information on