(CNN) — Costco will raise its starting rate for hourly store workers in the United States to $16 an hour, putting its starting wage above rivals such as Amazon, Target and Best Buy.

Costco has around 180,000 US employees, and 90% of them work hourly. It will hike its minimum wage to $16 beginning next week, chief executive Craig Jelinek said Thursday at a US Senate Budget Committee hearing on worker pay at large companies.

The move comes as Democrats in Congress seek to rally support for a $15 federal minimum wage. Sen. Bernie Sanders is the driving force behind Congress’ current push to raise the federal minimum wage, introducing a bill last month to increase it to $15 by 2025. President Joe Biden has also backed a $15 minimum wage. The federal minimum wage has stood at $7.25 an hour since 2009, but a growing number of cities and states are raising their minimum wage.

Costco, based in Issaquah, Washington, raised its minimum wage to $14 in 2018 and $15 in 2019. The company says 20% of its hourly employees make the minimum wage.

More retailers and restaurant chains have also moved to a $15 an hour minimum rate. Amazon raised its starting wage to $15 in 2018, while Target and Best Buy bumped up their minimums to $15 last year. Walmart, the largest US retailer, has an $11 minimum wage, and it said last week that it planned to raise pay for around 425,000 employees, a quarter of its workforce, to at least $13 an hour.

Arindrajit Dube, a professor of economics at the University of Massachusetts Amherst who studies the minimum wage, said Costco’s move would put pressure on rival employers such as Amazon to match its $16 minimum.

Although some companies have moved to $15 an hour or above, many business leaders oppose a $15 federal minimum wage. Some employers, particularly small businesses, have fought against raising the minimum wage to $15, saying it could prompt layoffs and even closures.

In a letter to Congressional leaders Wednesday, the Business Roundtable suggested for the first time that the minimum wage hike should be linked to progress in defeating the coronavirus pandemic.

Also on Wednesday, Matthew Shay, president of the National Retail Federation, a lobbying group for retailers, said on a call with reporters that “it doesn’t make sense for the federal government to be in the business of dictating wages in an economy as broad and diverse in scope as this one is…It’s best to let market conditions dictate” wages.

—CNN’s Tami Luhby and Matt Egan contributed to this article.

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