Earlier this week, the WHO published a study claiming that red meats - particularly processed red meats - are carcinogenic. While it is unlikely that this study will cause Americans to stop eating red meat in general, there is one red meat that is absolutely off the table: horse meat. There are currently no operational equine slaughterhouses in the United States. However, that does not mean that horses aren't shipped to slaughter in this country. Both Mexico and Canada allow horse meat to be processed and sold. Some of that meat comes from horses that originate in the U.S.
In April of this year, Rep. Frank Guinter (R-NH) introduced the Safeguard American Food Exports Act. The entire text of the bill is available here. Essentially, this bill would ban the export of horses and other equines for slaughter and consumption. It would establish Congressional recognition that the United States does not raise horses for consumption, and that horses in the U.S. are regularly treated with medications that are unsafe for human consumption. The same bill has been introduced in the Senate by Senatory Robert Menendez (D-NJ).
The bill has been referred to committees in both the House and Senate.