A “multi-day readiness exercise” will take place after Donald Trump deployed an “armada” to the Middle East.

A number of Middle Eastern governments are trying to push the U.S. and Iran into talks to head off a possible conflict, efforts that so far are failing to gain traction as both sides dig in.

Retaliation by Tehran to a US attack would likely target some of the tens of thousands of American troops deployed across the Middle East, with Iran's army spokesman warning that Washington has numero...