Earlier today, Democrats announced that Costco CEO Jim Sinegal will be speaking at their convention in September. But while Sinegal has been a faithful supporter of President Obama, even holding a fundraiser for the president at his Washington state home recently, the choice of him as a speaker in Charlotte is likely once again to aggravate labor unions.

After all, Sinegal was a strong opponent of the Employee Free Choice Act–also known as “Card Check”–which was the Obama administration’s big labor bill that promised to expand unions and was staunchly opposed by Republicans and business leaders. The bill failed to pass Congress.