Banks, credit card issuers and other financial companies will be able to block customers from banding together to sue over disputes, after the U.S. Senate on Tuesday narrowly killed a rule banning the firms from using “forced arbitration” clauses.

Republican Vice President Mike Pence appeared on the Senate floor to cast the tie-breaking vote as the chamber’s president and approve the most significant roll-back of Obama-era financial policy since President Donald Trump took office vowing to loosen the leash on Wall Street. The final count was 51 to 50.

After a signature from Trump, expected soon, the resolution will abruptly end a years-long fight that has included multiple federal regulators, consumer advocacy groups, and financial lobbyists.

Read more in Reuters.