Sen. John McCain (R-Ariz.) argued Wednesday that President Obama should consider bombing Syria without congressional approval, because the credibility of the White House is now on the line. McCain said that if Obama acts before any vote in Congress, he could argue that he has acted in conformity with past administrations, including President Reagan’s invasion of Grenada in the 1980s. “He notified everybody the next morning,” McCain noted at a Wall Street Journal breakfast roundtable. The senior Republican acknowledged the decision would be a difficult one, but he said he did not think members of his own party would try...