https://www.washingtonpost.com/resizer/U-iAZtMbIyWFxpBiQPArKizn3fw=/1484x0/arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/32CAWZGFXYI6RGY4VEHR3KXDBE.jpg washingtonpost.com record number of families crossing u.s. border as trump threatens new 2018-10-17 ., chief of Border Patrol's Rio Grande Valley South Texas, said on Twitter. ..…