US President Donald Trump has drastically scaled back foreign aid as part of a review of foreign spending in a move some aid officials say could put millions of lives at risk.

The Danish group, which provides assistance to refugees and those displaced by disaster and conflicts, said the US retrenchment would lead to "untold suffering and deaths" in a statement announcing the restructure.

"The scale of the current funding crisis demands that Democratic Republic of Congo (DRC) adapt, renew itself, and prepare for a world where US assistance will not resume," the DRC said in a statement.

"Losing our second-largest funding partner will mean a reduced global footprint; most of all, it is a blow to millions of people displaced by conflict, disaster and climate change."

The US previously accounted for 20% of its budget.

The group said it would end programmes in six countries - Burundi, Central African Republic, Georgia, Kosovo, Mexico, and Tanzania , and remain present in 28 others.

Prior to the latest job cuts, the group had already cut 1300 staff positions since February as a direct consequence of the US funding cuts, it said.

--Reuters--