Unionized Starbucks workers have started their fourth day on strike. 

Workers walked off the job in over 40 cities last week. 

And this year’s strike has gotten attention from high-profile politicians. Both Seattle mayor-elect Katie Wilson and New York's mayor-elect Zohran Mamdani called on customers to boycott the coffee chain. 

Last week, Senator Patty Murray (D-WA) urged Starbucks to cut a deal with the union. 

So what’s holding up negotiations? 

GUEST: Casey Martin, KUOW reporter covering the strike

RELATED LINKS: 

• Unionized Starbucks' workers strike in Seattle, across the country

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