He continued meeting and greeting global leaders by holding phone conversations with five leaders
The 45th president has had a jam-packed first week in week in office, signing a flurry of executive orders including banning Muslims from certain countries entering the US, and laying the framework for his controversial wall with Mexico.
And he welcomed prime minister Theresa May to Washington, the first world leader to have an audience with the billionaire.
He continued greeting global leaders by holding phone conversations with five of his counterparts, German Chancellor Angela Merkel, Japanese prime minister Shinzō Abe, French president François Hollande, and the prime minister of Australia, Malcolm Turnbull.
He phoned the leaders from the Oval Office, enjoying a 45 minute chat with Mrs Merkel.
Being President Trump: Key Moments
Fri, January 27, 2017
Inside Donald Trump's first week in the White House.
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Trump speaks briefly to reporters as he arrives aboard Air Force One at Joint Base Andrews
Mr Trump invited Mrs Merkel to visit him in Washington “soon”, White House sources confirmed.
And the German Chancellor in turn extended an invitation to the president to join the G20 summit in Hamburg in July.
They both acknowledged how important German-American cooperation was for mutual security, and also promote stability in the wider world.
Mr Trump agreed with Mrs Merkel that there was a need to strengthen ties to fight terrorism and extremism, and work harder to stabilise conflict zones, particularly in the Middle East and Africa.
Mr Trump invited Mrs Merkel to visit him in Washington “soon”
And the pair both admitted that all NATO members need to pay their fair share towards “our collective security”, and recognised how important NATO was to the transatlantic relationship enjoyed by the US and Europe.
The Kremlin issued a statement after the phone-call between Mr Trump and Mr Putin, saying they discussed cooperating in Syria to defeat ISIS, adding the priority was uniting to defeat international terrorism.
They stressed the importance of restoring mutually beneficial trade and economic ties, and stabilising relations between the countries.
It is widely anticipated Mr Putin formally congratulated Mr Trump on assuming office
The new US president also brought up the Iranian nuclear programme and the situation in North Korea and the Korean peninsula as a whole.
And Mr Trump has agreed to keep in regular contact with Mr Putin, and the pair also confirmed they would work on arranging a face-to-face meeting.
But there was no mention of easing sanctions on Russia, imposed after Moscow annexed Crimea in 2014 leading to bloody and civil unrest in Ukraine.
If we can get along with Russia, that's a great thing
It is widely anticipated Vladimir Putin formally congratulated Mr Trump on assuming office, despite a brief conversation after Mr Trump’s election victory to congratulate him.
The 70-year-old previously said of the Russian leader: ”I don't know Putin, but if we can get along with Russia, that's a great thing.
”It's good for Russia, it's good for us; we go out together and knock the hell out of ISIS, because that's a real sickness.”
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Previously it was thought vice-president Mike Pence would sit in and join the discussion, but it was later confirmed only the two leaders would speak.
Kremlin spokesman, Dmitri Peskov, said ahead of the call: “Of course, usually during such contacts there is an exchange of views on the main parameters of the current state of bilateral relations.”
The outspoken tycoon has indicated his administration may herald a thawing in relations between the two superpowers, and his team have recently said that Russian sanctions are “under consideration”.
Previously it was thought vice-president Mike Pence would sit in and join the discussio
But sanctions were not discussed during the phone-call.
The issue is divisive, with some Republicans including Senator John McCain and Democratic Senator Chuck Schumer reportedly mooting a bill to curb Mr Trump’s ability to lift the sanctions without the approval of Congress.
And earlier this month Donald Trump inferred the lifting of sanctions could be tied to a nuclear arms reduction treaty, something Moscow flatly refused.
He phoned the leaders from the Oval Office, enjoying a 45 minute chat with Mrs Merkel
Sergei Karaganov, honorary chairman of the Russian Council on Foreign and Defense Policy, has urged for dialogue between the two countries over the issue of nuclear weapons.
He said a solution must be found "based not on the reduction or increase of nuclear arsenals, but on the preservation of the global status quo."
And in his chat with the French leader, president Hollande warned Mr Trump against taking a protectionist approach, referencing his “America first’ rhetoric.
President Hollande warned Mr Trump against taking a protectionist approach
He said it would have economic and political consequences, adding democratic principles should be respected.
A statement from the Frenchman’s office quotes Mr Hollande as telling his counterpart: “In an unstable and uncertain world, turning inward would be a dead-end.”
— Sean Spicer (@PressSec) January 28, 2017
And he brought up the issue of climate change, which Mr Trump claims was invented by China, stressing the importance of the Paris agreement.
Mr Hollande also told Mr Trump that NATO was indispensable, again picking up on the Commander in Chief’s comments throwing shade on the US’s future role in the alliance and echoing Mrs Merkel.