France and Germany are "concerned" over a number of decisions by US President Donald Trump, particularly his move to restrict refugee arrivals, French Foreign Minister Jean-Marc Ayrault said Saturday.

"This decision can only cause us concern," he said following a meeting with his German counterpart Sigmar Gabriel.

"Welcoming refugees who are fleeing war is part of our duty."

"But there are a lot of other issues that are causing us concern", he said.