A trickle of refugees have been allowed to cross the border from Greece into Macedonia - the first for two days following clashes earlier this week.
Macedonia briefly opened the border crossing overnight, letting around 170 people cross, Greek Police said.
However some 10,000 people remain camped at the crossing, awaiting their turn.
It comes after clashes broke out on Monday as hundreds attempted to storm the border crossing.
Video report by ITV News News At Ten presenter Tom Bradby
Most experts thought the migrant crisis would ease up over the winter when the weather made the Mediterranean crossing more treacherous.
But that appears to have acted as only a modest deterrent.
More than 120,000 people have made the crossing in just the first two months of this year.
But with barbed wire fences going up and thousands stuck at the Greek-Macedonia border, do Europe's leaders have a plan?
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.