Greg Bovino thinks the Trump administration is weak on mass deportation. And he’ll share viewpoint that message anywhere he can — even on a whiskey bottle. Months removed from his unceremonious dismissal as the public face of President Donald Trump’s aggressive immigration-enforcement surge, the former Border Patrol “commander-at-large” has found a new role as an anti-immigrant influencer, sharing his radical views with anyone who will listen. He regularly mixes in criticism of his former employers for what he views as their failure to live up to Trump’s mass deportation pledge. Bovino has traveled to Europe to speak with members of...