stumbling block

Trump has made clear how much he wants this, and it could be a stumbling block down the road.

The chip seeks to address one of the biggest stumbling blocks to the development of quantum computers - making them error free.

Updating reporters on Monday, White House National Security Council spokesman John Kirby told reporters: "The main stumbling block continues to be Hamas."

Dr Bloomer, who has been involved in academic research on foetal abnormalities, said the main stumbling block is funding earlier screening.

But this may be the first season in which politics joins that list of possible stumbling blocks, even if they don’t say so.