Starbucks (SBUX) stock dropped as much as 6.7% Tuesday in after-hours trading as the coffee giant's second quarter earnings report disappointed Wall Street and cast a shadow over its CEO's plan to turn around the company.

By Juveria Tabassum (Reuters) -Starbucks faces challenges in reviving its business, CEO Brian Niccol said on Tuesday, after the coffee giant posted disappointing global comparable sales and profit with inflation and economic uncertainty driving up costs and dampening U.

Shares of Starbucks have fallen 8% this year, as investors worry about tariffs and how they will affect consumer spending.