Horace is a $75-$year$-$old man living in Coleman County, Texas. He relies on Social Security for a stable income and Medicare for basic health care. He is concerned by statements from prominent Republicans that they seek to roll back funding for both programs. Which interest group shol he join to help it protect these federal entitlement programs?

the American Civil Liberties Union $($ACLU$)$

the Texas Municipal League $($TML$)$

the Texas Business Roundtable

$$ the American Association of Retired People $($AARP$)$