WASHINGTON — Sen. Rand Paul is calling for conservatives to embrace the cause of immigration reform, outlining a proposal that would grant some form of legal status to the estimated 11 million illegal immigrants after the federal government has certified that the border is secure. Paul’s proposal, outlined in a speech to the Hispanic Chamber of Commerce in Washington on Tuesday, carefully avoided the term citizenship. Instead, the Kentucky senator said he sought a middle ground that would include a multi-year process of granting visas to undocumented workers that would hinge on the annual verification of the security of the...