http://www.dailykos.com/story/2015/07/23/1405016/-Democrats-win-as-Social-Security-cuts-removed-from-Senate-highway-nbsp-bill
"Two provisions to cut Social Security benefits in the proposed highway bill caused Democrats in both the Senate and House to revolt. Democrats have succeeded in getting both of those provisions removed, but now Senate Majority Leader Mitch McConnell is facing a serious challenge in getting the bill past his own party, in both chambers of Congress."