The Pentagon is preparing for weeks of ground operations in Iran, U.S. officials said, as thousands of American soldiers and Marines arrive in the Middle East for what could become a dangerous new phase of the war should President Donald Trump choose to escalate. Any potential ground operation would fall short of a full-scale invasion and could instead involve raids by a mixture of Special Operations forces and conventional infantry troops, said the officials. All spoke on the condition of anonymity to discuss highly sensitive military plans that have been in development for weeks. Discussions within the administration over the...