Cerar, speaking to the press after the summit, stressed that everybody had expressed unity in the discussion on the attitude towards the new US administration.

"There is no rift. Even the British prime minister said that she wanted the EU to act as one," he added.

According to Cerar, the UK remains a part of Europe and is ready to help stabilise the relations with the new US administration as soon as possible.

"We all want that trans-Atlantic relations remain good and that they further improve," said the Slovenian prime minister.

The importance of good cross-Atlantic relations was also emphasised by European Council President Donald Tusk, who said this remained an absolute priority because it was a pillar of the free world.

In a pre-summit letter to EU leaders, Tusk placed the new US administration alongside Russia and radical Islam among the external threats to the Union.

Asked about the reactions after the summit, he said he was given full support, while noting that European leaders had different temperaments and ways to express themselves.

But they all have one goal - to protect the EU and European dignity and interest, he added.

Speaking before the summit, Cerar said that Trump's first moves had certainly been received with unease in many countries across the world, but that it was too soon for a realistic and final assessment.

"Let's wait, these are the first weeks of his rule. I believe that more time is required for a realistic assessment."

But Cerar was quick to add that he expected the US to continue advocating democratic values and that constructive and good relations both within NATO and between the US and the EU would be re-established.

With migration being the main topic of the summit although somehow overshadowed by the discussion on Trump, Cerar noted that the EU must be united in tackling illegal migrations and security to be able to address other important issues.

He also warned that a migration route via the Adriatic Sea and the Istrian Peninsula had opened saying that Slovenia would work decisively to close it.

Cerar also announced that European Commission President Jean-Claude Juncker would visit Slovenia at the beginning of March.

He said the visit, coming upon Cerar's invitation, would focus on issues that concern the entire EU as well as those affecting Slovenia, notably the protection of the Teran wine and the extension of checks on the Austria-Slovenia border.

Cerar also met German Chancellor Angela Merkel and his Swedish counterpart Stefan Löfven, who will soon pay a visit to Slovenia.

The prime minister also discussed the situation in the Balkans with EU foreign policy chief Federica Mogherini.