"Back in 2013, then-Senate Majority Leader Harry Reid changed the Senate’s filibuster rules so presidential Cabinet nominees only required 51 votes, rather than 60, to be confirmed."
http://www.vox.com/policy-and-politics/2017/1/17/14251600/tr...
http://www.vox.com/policy-and-politics/2017/1/17/14251600/tr...
http://www.usatoday.com/story/news/politics/2013/11/21/harry...