This article characterizes the new R senators as belonging more to the establishment wing of the party, in part because the party was fairly successful in getting its preferred candidates through the primaries, avoiding some of the surprises that characterized 2010/2012: http://www.nytimes.com/2014/11/16/us/new-senators-tilt-gop-b...

Some do have more track record in that regard than others though, so it might be that they won't all side with the national-security conservatives.