“We regret very much the embarrassment that’s been caused to you,” the US leader said during the call.
Baroness Thatcher was angered that she was not consulted before the Americans invaded a Commonwealth state.
United States troops were sent to Grenada in 1983 to topple the Caribbean island’s Marxist regime.
While US forces were still in action, the president phoned Lady Thatcher to explain the action he had taken.
“If I were there, Margaret,” he said, “I’d throw my hat in the door before I came in.”