Despite billions of dollars in new Border Patrol agents and fencing, the Senate’s immigration bill will still only stop between a third and half of all illegal immigrants, according to the latest analysis the Congressional Budget Office released Tuesday morning. Backers have said they guaranteed that the bill, which passed the Senate on a 68-32 vote last week, would stop a new wave of illegal immigration, which they said was the necessary precondition for legalizing the current illegal population. But the CBO’s analysis says illegal immigration will continue and be at least 50 percent of what it would otherwise have...