US President Donald Trump spoke with German and Italian leaders, a White House official said, ahead of a G20 summit this week.
The summit of the Group of 20 leading economies could expose Mr Trump's sharp differences with world powers on trade and other issues.
He is preparing for the two-day summit that starts in Hamburg on Friday, just over a month after a G7 summit in Sicily showed deep divisions between Mr Trump and other Western leaders on climate change, trade and migration.
A fractious first NATO summit with Mr Trump also left European allies wondering where the military alliance goes next.
Mr Trump will hold separate meetings with various leaders in Hamburg, including host German Chancellor Angela Merkel, and a potentially difficult first meeting with Russian President Vladimir Putin.
Mr Trump announced on Twitter that he would be talking on the phone with leaders from Germany, Italy and France today.
The White House later said in a statement that the calls would be with Merkel and Italian Prime Minister Paolo Gentiloni, but did not mention French President Emmanuel Macron.
Mr Trump and Mr Macron spoke last week when the US President accepted an invitation to attend Bastille Day ceremonies in Paris on 14 July.
Representatives for the White House did not immediately reply to a request for comment. Representatives for Mr Macron's office could not immediately be reached for comment.
In remarks last week, Ms Merkel raised the prospect of an open clash with Mr Trump at the Hamburg summit, although some Trump administration officials have played down the discord.
Russia and the United States are still discussing the timing of the encounter between Mr Trump and Mr Putin, a Kremlin aide has said.
Since Mr Trump was elected US president, Russians has been keenly anticipating his first meeting with Mr Putin, hoping it would trigger a reset in US-Russia relations that plunged to post-Cold War lows under Mr Trump's predecessor, Barack Obama.
No imminent visit to UK for Trump - White House
US President Donald Trump is not planning a surprise visit to the UK, his spokesman has said, ending uncertainty about whether he would drop in on one of his golf courses.
Reports had suggested Mr Trump could make an unannounced visit to one of his Scottish golf resorts during an official visit to Europe this month.
But White House press secretary Sean Spicer said Mr Trump would not visit the UK in the coming weeks.
"While he looks forward to visiting the UK, it will not be in the next two weeks," Mr Spicer told the Financial Times.
The Sunday Times reported that the president could give as little as 24 hours' notice to the Government of any planned trip, leaving ministers including British Prime Minister Theresa May only a brief period to arrange possible meetings.
Mrs May’s official spokesman told reporters at a regular Westminster media briefing: "I am not aware of any plans for the president to visit the UK in the next few weeks."
There are Trump golf courses in Aberdeenshire and Ayrshire.
Mrs May invited Mr Trump on a state visit to the UK shortly after he took office, but speculation that it may have been put on hold was fuelled by its absence from last month's Queen's Speech.
Reports suggested Mr Trump wants it delayed until it can take place without protests.
Asked whether a state visit would take place during 2017, the PM's spokesman said: "We have extended an invitation, it has been accepted and we will set out plans in due course."
Mr Trump is crossing the Atlantic later this month for visits to Poland, the G20 summit in Germany, and Bastille Day celebrations in France.
