Descendants of the Rev. Martin Luther King Jr. will lead more than 100 civil rights groups in a march on Washington on Monday, the holiday honoring the slain civil rights leader, to urge Democrats to push through a bill expanding voting rights protections, reports Reuters.

The annual Martin Luther King Jr. Day D.C. Peace Walk comes after President Biden called on Senate Democrats to change the chamber’s filibuster rule to prevent Republicans from blocking the legislation.

Two key moderate Democrats, Sens. Kyrsten Sinema (D-Ariz.) and Joe Manchin (D-W.V.), said they oppose the rule change, leaving Democrats without the votes they need. Democrats say the legislation would counter voting restrictions approved by Republican-controlled state legislatures. Republicans opposed the bill, calling it a partisan power grab.