This article references the Johnson amendment.
http://www.washingtontimes.com/news/2015/apr/28/frank-gaffney-senates-institutional-suicide/
The importance of this vote can not be overstated. If it goes down in defeat, not only is a massive blow to the Constitution but the chance of an Israeli-Iranian war goes up.
Senate will vote on Johnson’s amendment at 6:10pm.
60 votes needed to pass.