Starbucks posted its first quarter of same-store sales growth in the United States and North America in two years on Wednesday, signaling early progress in its turnaround efforts under CEO Brian Niccol.

Twenty-six U.S. senators and 82 House representatives have called on Starbucks CEO Brian Niccol to resume contract negotiations with the company’s workers’ union, accusing the coffee giant of returning to “union-busting” tactics.

Starbucks CEO Brian Niccol has announced plans to streamline operations as part of the company’s "Back to Starbucks" initiative, which will involve job eliminations and smaller support teams.