As Amazon executives were trying to crush a union drive among workers in Bessemer, Alabama, President Joe Biden released a video message declaring his general support for the rights of workers to decide whether to form unions. Biden, however, has so far stopped short of trying to use his executive authority to fulfill two campaign promises that could boost such unionization efforts.

During the 2020 campaign, Biden’s platform included support for a pair of measures designed to deter the kind of union-busting at play in Alabama. One is a Department of Labor measure known as the “persuader rule,” which would require employers to more thoroughly disclose their spending on anti-union consultants. The second is known as the “neutrality rule,” which would require federal contractors like Amazon to remain neutral during unionization campaigns. Both would signify major steps toward fulfilling Biden’s campaign pledge to be “the most pro-union president you’ve ever seen.”

The Protecting the Right to Organize (PRO) Act, a major piece of labor legislation that Senate majority leader Chuck Schumer has promised will get a floor vote if it gets fifty cosponsors, contains important provisions that would have changed the way the Amazon union election played out, including both the persuader and neutrality rules. But unless the Senate abolishes the filibuster — which isn’t a possibility as long as conservative Democrats Joe Manchin and Kyrsten Sinema are opposed to doing so — the PRO Act doesn’t have a shot of passing a 50-50 Senate.