RIYADH, Saudi Arabia — Saudi officials have firmly warned the United States in recent days that an Israeli ground incursion into the Gaza Strip could be catastrophic for the Middle East.Sen. Richard Blumenthal, D-Conn., a member of the Armed Services Committee, was one of 10 senators who met last weekend with Crown Prince Mohammed bin Salman, the kingdom’s de facto ruler, in Riyadh, the Saudi capital.“The Saudi leadership was hopeful that a ground operation could be avoided for reasons of stability as well as the loss of life,” Blumenthal told The New York Times on Thursday. Saudi officials warned it...