undertaking

The Secret Service, which will take a lead role, called it “a huge undertaking” and costs are expected to be $1 billion to $2 billion.

In a video released in September, the Princess said she had completed the treatment and was "looking forward to being back at work and undertaking a few more public engagements in the coming months".

"Harbouring the subversive elements accused of undertaking activities detrimental to a friendly country posed both a diplomatic and humanitarian dilemma to Kenya," he added.

Prosecutors said the group - known as the Saechsische Separatisten or "Saxony Separatists" - was undertaking military training for the collapse of the German government and society, which it believed would come on an unspecified "Day X".

The lawsuit, which was filed in Philadelphia Common Plea Courts, is the first challenge to Musk’s bold undertaking.