European Commission chief Ursula von der Leyen has expressed her concern over the limited time to negotiate a trade deal with the United Kingdom, after it leaves the European Union.

UK Prime Minister Boris Johnson's withdrawal agreement envisages a transition period of post-Brexit negotiations, which Johnson's bill ensures will end in 2020. Within this timeframe, London and Brussels should agree on a trade deal and on cooperation on key security issues.

“It seems to me that on both sides w...