The strategy also focuses on rooting out “violent left-wing extremists” at home and abroad, as Trump’s conservative administration steps up its political attacks on opponents.

“It is clear to all that well-organised hostile groups exploit open borders and related globalist ideals. The more these alien cultures grow, and the longer current European policies persist, the more terrorism is guaranteed,” the strategy said.

“As the birthplace of Western culture and values, Europe must act now and halt its willful decline,” said the strategy, led by counterterrorism coordinator Sebastian Gorka, who has been accused of links to far-right groups.

The fresh criticism of Europe comes just months after Trump’s new national security strategy said the continent faced “civilisational erasure” due to immigration.