From the 2002 General Instruction of the Roman Missal (GIRM) approved for the USA, which can be accessed from
romanrite.com/girm.html :
“182. After the priest’s Communion, the deacon receives Communion under both kinds from the priest himself and then assists the priest in distributing Communion to the people. If Communion is given under both kinds, the deacon himself administers the chalice to the communicants; and, when the distribution is completed, he immediately and reverently consumes at the altar all of the Blood of Christ that remains, assisted if necessary by other deacons and priests.”
So the deacon receives Communion from the priest. But after everyone has received Communion he consumes what remains of the Blood of Christ. The second time the priest does not present him with the chalice, saying “The Blood of Christ”.