US President Donald Trump is in Paris where he has held talks with his French counterpart Emmanuel Macron.
At a joint news conference, Mr Trump said: "The friendship between our two nations and ourselves is unbreakable".
Donald Trump says his son is a 'wonderful young man' who did nothing wrong https://t.co/DsjNZACq6U pic.twitter.com/v9aIsAYzLp
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Mr Trump's trip to France is overshadowed by continuing questions surrounding his son Donald Jr's meeting with a Russian lawyer ahead of the US Presidential election.
Mr Trump said his son is a "wonderful young man" who met a Russian lawyer, not a Russian government lawyer.
He said nothing happened at the meeting and his son did nothing wrong.
"As far as my son is concerned, my son is a wonderful young man. He took a meeting with a Russian lawyer. Not a government lawyer, but a Russian lawyer. It was a short meeting," he said.
"From a practical standpoint, most people would have taken that meeting," Mr Trump added.
What is the mood of the meeting between US President Donald Trump and French President Emmanuel Macron in Paris? @mitchefi reports pic.twitter.com/hy6Ding33d
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US House of Representatives Speaker Paul Ryan has urged the president’s eldest son to testify to a congressional committee about alleged links between Mr Trump's team and Russia in the 2016 presidential election campaign.
Senate Judiciary Committee Chairman Charles Grassley plans to send a letter today to Mr Trump Jr to ask him to testify before his committee in a public session, CNN reported.
If he appeared before the panel, Mr Trump's son would be the highest member of the Republican president's inner circle of relatives and White House aides to testify in Congress about the Russia allegations.
Meanwhile, Mr Macron said he "respected" his US counterpart's decision to pull out of the Paris climate accord but that France remained committed to the 2015 pact.
But Mr Trump suggested that he could change his position on the Paris climate accord.
Six weeks after announcing that the US would abandon the 2015 pact, he said: "Something could happen with respect to the Paris accord," adding: "We'll see what happens."
Mr Trump, whose country is the world's second biggest producer of greenhouse gases after China, drew widespread criticism when he announced the he would quit the climate pact.
Mr Trump said he and Mr Macron also discussed strengthening security cooperation, and urged allied forces fighting the so-called Islamic State to ensure Mosul remained a liberated city.
"Today we face new threats from rogue regimes like North Korea, Iran and Syria and the governments that finance and support them. We also face grave threats from terrorist organisations," Mr Trump said.
"We renew our resolve to stand united against these enemies of humanity and to strip them of their territory, their funding, their networks and ideological support."
Earlier, the US president and Mr Macron toured the Hotel des Invalides where Napoleon Bonaparte and other French war heroes are buried.
Patting Mr Trump on the back several times, the French president smiled as they began a tour of the grand 17th century military complex.
Mr Macron and Mr Trump held talks this afternoon before dining with their wives at a restaurant on the second floor of the Eiffel Tower.
Mr Trump went to France beset by allegations of Russian interference in the 2016 US election, with emails released on Tuesday suggesting his eldest son welcomed an offer of Russian help against his father's Democratic rival Hillary Clinton.
Weeks after Mr Macron hosted Russian President Vladimir Putin at the Palace of Versailles, Mr Trump will bask in the trappings of the Bastille Day military parade tomorrow and commemorations of the entry 100 years ago of US troops into World War I.
For Mr Macron, the visit is a chance to use soft diplomacy to win Mr Trump's confidence and set about influencing US foreign policy, which European leaders say lacks direction.
Mr Macron views it as counter-productive to isolate the United States on the world stage, and progress may be made on joint approaches to counter-terrorism and security.
"What Emmanuel Macron wants to do is bring Trump back into the circle so that the United States, which remains the world's number one power, is not excluded," French government spokesman Christophe Castaner told BFM TV.
The 14 July celebrations come a year after a Tunisian man loyal to the so-called Islamic State ploughed a truck through revellers on a seafront promenade in Nice, killing more than 80.
During the US election campaign, Mr Trump said a wave of militant attacks showed "France is no longer France", urging a tougher stance on immigration and jihadism.
The Elysee official said the intended symbolism of dinner at the Eiffel Tower was that "Paris is still Paris".
In bringing Mr Trump to Paris, Mr Macron has stolen a march on Britain's embattled Prime Minister Theresa May.
London's offer of a state visit for Mr Trump met fierce criticism and warnings that he would be greeted by mass protests.
An Elabe poll showed that 59% of French people approved of Mr Macron's decision to invite Mr Trump.
