The Ways and Means Committee and United States Committee on Finances have jurisdiction over Social Security.
Please contact both Committees and ask them to repeal WEP and GPO. Here are their contacts.

Jurisdiction of the Committee on Ways and Means

The U.S. Constitution requires that all bills regarding taxation must originate in the House of Representatives. The Committee of Ways and Means is the chief tax-writing committee of the United States House of Representatives. Members of the Ways and Means Committee are not allowed to serve on any other House Committees unless they apply for a waiver from their party's congressional leadership. The Committee has jurisdiction over all taxation, tariffs, and other revenue-raising measures, as well as a number of other programs including:

Social Security
Unemployment insurance
Medicare

The Committee on Finance of the Senate have jurisdiction of
Social Security Administration (SSA) Old-Age, Survivors and Disability Insurance (OASDI)
Supplemental Security Income (SSI)
[Provides monthly cash benefits to eligible beneficiaries]
Inspector General
Railroad Retirement BoardRailroad Retirement

Here are way to contact both Committees.

The Ways and Means Committee Democrats are interested in any information regarding the waste, fraud, and abuse of taxpayer dollars. We respect your need to remain confidential and will use your contact information only to follow up with you regarding your submission. If you do not wish to provide contact information, you may leave the contact fields below blank.

https://waysandmeans.house.gov/contact/tip-line

https://waysandmeans.house.gov/subcommittees/social-security-116th-congress

https://www.finance.senate.gov/contact

https://www.finance.senate.gov/about/jurisdiction

Both Committees have a Face book pages where you can leave a message or post to their pages as well.