Trump to honour Macron, his unlikely French friend

They talk regularly, have shared memorable handshakes and supposedly have an "unbreakable" friendship. When US President Donald Trump and France's Emmanuel Macron meet next week, there will be more back-slapping -- but also major differences.

The Trump-Macron relationship has been one of the few stable elements in recent American foreign policy, with the French leader emerging as the privileged European partner for the White House.

While Trump's relations with German Chancellor Angela Merkel have often been tetchy and he has clashed publicly with British Prime Minister Theresa May, the mercurial US leader has been consistently friendly with France's 40-year-old centrist.

Their warm ties will be on display from Monday when Macron becomes the first foreign visitor during Trump's term to be honoured with a state visit, nine months after Trump was guest of honour during France's national day on July 14 last year.

"The visit comes at a time of extremely close relations between France and the United States with regular and intense exchanges between the two presidents," an aide to Macron told reporters this week.

The aim of the trip is to "continue and reinforce this dynamic," he added. Although their political background, age and personal lives are sharply different, the two men have bonded over their role as outsiders who outwitted their established political rivals to gain power.

"The friendship between our two nations and ourselves is unbreakable," Trump told Macron during his trip to Paris last July, which ended with their famous 25-second-long handshake.

They have since worked closely on the fight against the Islamic State group in Iraq and Syria and coordinated Western strikes on Syrian regime chemical weapons installations last weekend.

But though they have found common ground on military matters, the list of subjects where they do not see eye-to-eye is long -- from climate change and the 2015 Iran nuclear deal to the role of the European Union and trade.

Furthermore, Macron never misses an opportunity to condemn the forces of right-wing nationalism and populism -- which brought Trump to power -- and did so again last week during a speech to the European Parliament.

"Everybody has been asking the same question: why is Macron getting along with Trump?" said Celin Belin, a former French diplomat working as a fellow at the Brookings Institute in Washington.

"The question is also why does Trump like Macron? I think he enjoys the respect Macron provides and he respects Macron's power." Belin believes Trump has also deliberately picked a favourite in the European Union "and he has picked France because it's strong militarily and not an economic threat, which is the opposite of Germany."