Will Lockheed’s F-35 become a casualty of Donald Trump?

America’s large defence groups have for decades relied on international allies to boost the sales of many of their weapons. However, the Trump administration’s wavering commitment towards the Nato alliance has prompted several countries to question their reliance on US armaments — triggering growing alarm among some industry executives.

“I am concerned that pure politics could damage our prospects in future competitions,” said one executive at a leading US contractor.

The concerns…