Facing the largest potential United States strike in 60 years, United Parcel Service has begun training non-union workers to ensure that deliveries of critical goods like prescription medications will not be interrupted.

Currently, about half of UPS’s workers are members of UPS teamsters, which voted overwhelmingly to strike if the company does not reach a new deal with the union by July 31st. The company has agreed to a number of the union’s demands, but the union is still seeking substantial pay raises for both full and part time workers.

“If it wasn’t for the part-timers, if it wasn’t for the full-timers, this country wouldn’t have ran through the pandemic. Ups made $100 billion. So they certainly can afford to reward the people that made them a tremendous success,” said Teamsters president Sean O’Brien.