Sen. John McCain (R-Ariz.) hasn't spent much time in the Capitol this year as he seeks the GOP presidential nomination. But one of his rare appearances this week provided a pretty salty exchange with a fellow Republican. During a meeting Thursday on immigration legislation, McCain and Sen. John Cornyn (R-Texas) got into a shouting match when Cornyn started voicing concerns about the number of judicial appeals that illegal immigrants could receive, according to multiple sources -- both Democrats and Republicans -- who heard firsthand accounts of the exchange from lawmakers who were in the room. At a bipartisan gathering in...