McCain vs. Paul: The War Over War

For a fresh view of the foreign policy debate simmering among Republicans, take a look at the recent war about war between Sens. John McCain of Arizona and Rand Paul of Kentucky.

Mr. McCain, the party’s 2008 presidential nominee, has squared off with Mr. Paul, who is thinking about running for president in 2016, over Mr. Paul’s effort to force an 11th-hour vote on a resolution to declare war on Islamic State militants and set limits on presidential power to wage it.

For Mr. McCain, a diehard hawk who is...