HOUSTON — The political operation of potential 2016 presidential candidate Ted Cruz continued to beef up Monday as a top aide to former Speaker of the House Newt Gingrich signed onto the senator’s team. Rick Tyler, Gingrich’s longtime spokesman who served as a top strategist to a super PAC that supported Gingrich’s 2012 presidential campaign, will join Cruz’s campaign-in-waiting to serve as a senior communications adviser. “I am honored to come on board with Sen. Cruz and join the effort to make D.C. listen to the American people,” Tyler said in a statement. “I believe he will emerge as the...