WASHINGTON (Reuters) - President Barack Obama will convene a meeting on Tuesday with the Republican and Democratic leaders of the U.S. Senate and its Judiciary Committee to discuss a Supreme Court nominee, the White House said on Thursday. The White House has contacted every member of the judiciary panel, both Republicans and Democrats, to discuss efforts to fill a vacancy on the Supreme Court following the death of Justice Antonin Scalia, White House spokesman Josh Earnest said at a news briefing. 