Wednesday , killing one person in the truck and leaving several members of Congress with minor injuries. A chartered Amtrak train full of GOP lawmakers traveling to their retreat in West Virginia hit a dump truck in the crossing grade earlier, killing one person in the truck and leaving several members of Congress with minor injuries.

Trump said he still plans to address the lawmakers Thursday at the Greenbrier resort in White Sulphur Springs, W.Va.

The president said authorities are still investigating the collision, saying there is “no understanding as to what happened.”