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"Wal-Mart is telling any veteran who has served honorably that if they want a job in the year after they separate from service, Wal-Mart is going to hire them. And their goal is to do it within 30 days of the veteran’s application," Michelle ObamaMichelle LeVaughn Robinson ObamaWe must mount an all-country response to help our Afghan allies Obamas, Bushes and Clintons joining new effort to help Afghan refugees Bidens, former presidents mark 9/11 anniversary MORE said.

But in his statement, Trumka asked, "After facing enemies abroad, is an $8.81 an hour part-time job the best we can offer returning veterans?"

"Already, working families and our economy are struggling against an epidemic of low-paying, low-benefit, part-time work. Instead of legitimizing that trend, we need to treat the talents of our veterans — and of all of America’s people — as a critical national resource," he continued.

Trumka has been a vocal critic of the big-box chain, which has resisted unionization at its stores.