House Republicans wrapped up impeachment hearings against Alejandro N. Mayorkas‚ the homeland security secretary‚ on Thursday‚ a little more than a week after the proceedings began‚ racing to charge him with failing to enforce the nation’s immigration laws. The Republicans are moving ahead without evidence that Mr. Mayorkas has committed high crimes or misdemeanors‚ the constitutional standard for impeachment‚ effectively seeking to remove him for immigration policies they argue have...