Former U.S. President Barack Obama is ending a five-day international trip in Paris, where he had lunch with French President Emmanuel Macron and gave a speech to business leaders, TASS reported.

Obama had a two-hour private lunch with Macron at the presidential Elysee Palace on Saturday. The area was placed under high security.

The French presidency said the meeting was expected to include a presentation about the Obama Foundation. No journalists were allowed at the meal.

Obama also met with former French President Francois Hollande, who said in a tweet that climate change was among the issues they discussed almost two years after they both signed the Paris agreement.

U.S. President Donald Trump has threatened to withdraw the United States from the agreement on reducing greenhouse gas emissions.

"We are confident the Paris agreement will be implemented," Hollande tweeted.

Obama mentioned climate change during his evening speech organized by a club for leaders from the internet and communications industries was on the theme, "Fear Less, Innovate More."

In a clear reference to his White House successor's threat, he remarked on the "absence of American leadership on the issue," making the audience laugh.

"But despite that, you're seeing American companies and states and cities continuing to work on this issue," Obama said.