Their relationship began with a show of machismo –- an extended, white-knuckle handshake on their first meeting last year in Belgium. Emmanuel Macron had reportedly studied Donald Trump’s style of domineering power-grabbing handshakes, apparently prepared to avoid being outdone by his counterpart. Instead, it was President Trump who at one point in the 5-second-long handshake attempted to withdraw his hand from Macron's firm grasp. The maneuver marked the start of what has become a close partnership between the two leaders, who recently joined forces along with the United Kingdom to strike Syria earlier this month. "It's no secret that President...