A senior US military commander made an unusual visit to the White House amid growing speculation about Iranian attacks. Among those who reportedly entered the West Wing was General Dan Cain, chairman of the Joint Chiefs of Staff and the most senior officer in the US military. The visit coincided with an intelligence briefing scheduled by President Donald Trump for 11:00 am. Kaine was reportedly seen leaving the White House shortly after the meeting ended. Meanwhile, the Pentagon is said to be preparing options for a short but intense military operation against Iran. Gulf governments have reportedly been warned to anticipate possible US strikes and Iranian retaliation. Kaine has previously participated in high-level discussions regarding possible military action against Tehran. Although officials have not confirmed whether his recent visit to the White House is related to Iran, the timing has fueled speculation that major decisions concerning the region may be imminent.