WASHINGTON — The White House on Monday blocked two more former aides to President Trump from testifying in House Democrats’ impeachment inquiry, but cleared a third witness, Corey Lewandowski, to appear publicly on Tuesday and answer questions about potential obstruction of justice by the president. The White House decisions amounted to mixed news for the House Judiciary Committee as it tries to crank up the intensity of an investigation devised to determine whether to recommend Mr. Trump’s impeachment for obstruction of justice and abuse of power — and to convince the public that such action is warranted. In Mr. Lewandowski,...
