The UFCW 770 union said on Saturday that approximately 48,000 grocery workers in Southern California voted to strike if necessary in order to demand higher wages from Kroger Co and Albertsons Companies Inc stores.

In their negotiations with the grocers, which began on Jan. 28, the United Food and Commercial Workers International Union (UFCW) has sought significantly higher and equal pay, adequate staffing, and sufficient working hours.

Workers are pressuring large corporations that have been posting record profits to offer more as food prices in the United States rise.

President Joe Biden, as well as Senators Bernie Sanders and Elizabeth Warren, have all expressed support for such demands.

The union said in a statement it would notify workers if a decision were made to strike.

It said there was a big disconnect between its proposal and the offer of an hourly raise of 60 cents, or less than a 1% increase, made by the grocers, including Ralphs, Albertsons, Pavilions and Vons.

Kroger-owned Ralphs called the union’s proposal unrealistic as it is expensive to do business in California, while proposing to maintain its nearly $133 million annual investment in health care benefits.

The grocer, which has around 190 stores in California, said it might start making contingency plans, including advertising for temporary workers, to keep its business running.

As the previous workers’ contract expired on March 6, the labor union has slapped unfair labor practice charges against the grocers.

The union said bargaining would resume on Wednesday and if talks failed, it would decide on the next steps.

It warned the workers not to walk out until it notified them and said it would have strike benefit funds available to support members if the companies forced the union to take action.

Ralphs said on Monday it hoped the union would return to the bargaining table with renewed interest in reaching a balanced deal.

Albertsons did not respond to a request for comment.