U.S. senators ask Starbucks about union dealings.

By The Exchange Team

4 senators have asked Starbucks how much company has spent on lawyers and consultants to counter growing union membership at hundreds of U.S. stores.

Sens. Elizabeth Warren, Ed Markey, Richard Blumenthal, and independent Bernie Sanders wrote a letter to Starbucks CEO Howard Schultz and its board late Tuesday.

Reuters saw a letter asking Starbucks to react within a month, citing "claims that Starbucks is engaging in illegal union-busting measures."

Starbucks stated in response to the letter, "We value every chance to share the facts and rectify errors about our company and our partners."

Approximately 245 of Starbucks' almost 9,000 company-owned U.S. stores have voted to unionize in the last year.

Senators want to see Starbucks' guidance to managers on how to deal with workers joining unions and whether the company's anti-union spending is included in its tax filings.

The corporation has been increasing perks, including enhanced coverage for adoption services on Monday, but only for non-union employees.