"I have great respect for the president of China", Trump said.
Trump's past comments predicting that other countries "will leave" the EU after Britain voted to do so previous year irked European leaders.
The president also took a swipe at Canada for policies he says are hurting US dairy farmers.
Standing just feet from Italian Prime Minister Paolo Gentiloni at a joint White House news conference, Trump complained about unfair trade relationships and other North Atlantic Treaty Organisation members failing to "pay their full and fair share for the cost of defense".
WASHINGTON (AP) President Donald Trump on Thursday hailed Italy's contributions to the wars in Iraq and Afghanistan and its efforts seeking stability in Libya, but dismissed the possibility of US intervention in that country, saying the USA has "enough roles".
European Parliament chief: United Kingdom election 'good for EU
This narrative would certainly explain why financial markets have bid up the pound since the snap election announcement. Demmer said Wednesday: "The German government assumes that the negotiations can be continued without disruption".
Moments after Gentiloni described American involvement as "critical", Trump said that he did not see any role for the U.S. in Libya.
The threat to get rid of or alter NAFTA is a potential problem for Canada, whose biggest trade partner is the United States. Since then, the North African country has been split into two competing parliaments and governments, each backed by a set of militias, tribes and political factions.
In meeting with Italian Prime Minister Gentiloni, Trump pushed Rome for more trade with the US.
"From Venice to Florence to Verdi to Pavarotti - friend of mine", President Trump said. "The US role in this is very critical", the prime minister said. Trump was asked if he would meet Pope Francis during a press conference with Italian premier Paolo Gentiloni at the White House Thursday.
US President Donald Trump appeared to soften his tone towards Europe in a meeting with Italian Prime Minister Paolo Gentiloni on Thursday.
Paris Terror Attack Comes Days Before French Elections
The so-called Islamic State group has said it was behind the attack in Paris - a city still scarred by bloody IS attacks in 2015. Here is what we now know about the shooting, which took place just days before the first round of the French election.
He is providing no details. Obamacare's repeal and replacement was a top campaign promise for Trump, and his aides have continued to negotiate changes to the bill with conservatives and moderates in the Republican caucus.
Iran is failing to fulfill the "spirit" of its nuclear deal with world powers, President Donald Trump has declared, setting an ominous tone for his forthcoming decision about whether to pull the US out of the landmark agreement. He says, "Iran is not living up to the spirit of the agreement and they have to do that".
President Donald Trump says young immigrants shielded from deportation - often referred to as "dreamers" - should "rest easy" about his immigration policies. "It shouldn't have been signed".
Both Gentiloni and Trump expressed solidarity with the people and the government of France for the terrorist attack in Paris, that happened just moments before their joint press conference at the White House.
Trump also condemned the Paris shooting incident in which one policeman was killed and two others wounded.
Scrapping Nuclear Deal May Embolden Iran's Hardliners
During his presidential campaign, Trump called the agreement "the worst deal ever" and vowed to review it once in office. Obama and others argued it was narrowly tailored to take the most unsafe prospect - a nuclear-armed Iran - off the table.
Like Mr Trump, Ms Le Pen has taken a strong stance on terrorism, suggesting heightened border control programs to combat the issue.
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