I had earlier posted the names of the members of the House Social Security Subcommittee. However, it's unlikely that that Subcommittee will advance any significant legislation in this Congress or, at least, that it could be passed. It would take 60 votes in the Senate to overcome filibuster and pass such legislation. It's hard to imagine any significant Social Security bill garnering 10 Republican votes in the Senate. Specifically, the Byrd Rule prevents budget reconciliation bills (which don't require 60 votes in the Senate) from containing provisions that affect Title II of the Social Security Act.
Legislation affecting Supplemental Security Income (SSI) is a different story. My understanding is that SSI legislation could be passed as part of a Budget Reconciliation bill. However, the budget reconciliation rules do forbid anything that extends beyond 10 years so anything affecting SSI would have to include a 10 year sunset provision. That's not a complete bar. Much tax legislation including 10 year sunsets has been passed as part of budget reconciliation bills. It's basically a challenge to future Congresses to re-up the provisions. Would that happen with SSI legislation? I don't know. The Biden campaign released an ambitious SSI plan but I've heard nothing about SSI since the election.
I do know that the Social Security Subcommittee lacks jurisdiction over SSI. That's under the jurisdiction of the Worker and Family Support Subcommittee. It could be the more important subcommittee in this Congress. Here are the Democratic and Republican members of that Subcommittee:
Worker and Family Support Subcommittee
Chair: Rep. Danny K. Davis
- Democrats
- Rep. Judy Chu
- Rep. Gwen Moore
- Rep. Dwight Evans
- Rep. Stephanie Murphy
- Rep. Jimmy Gomez
- Rep. Dan Kildee
- Rep. Jimmy Panetta
- Republicans
- Republican Leader Tom Reed (R-NY)
- Rep. Tom Rice (R-SC)
- Rep. Jodey Arrington (R-TX)
- Rep. Ron Estes (R-KS)
- Rep. Kevin Hern (R-OK)