It will stoke fears that Sir Keir will unpick Brexit while re-negotiating the post-Brexit trade deal with Brussels, with most of his Cabinet having voted to Remain.
The PM said the Washington summit, which will be attended by 23 EU countries would provide a 'really important window of opportunity' to make progress on building new relations.
The Prime Minister is expected to discuss options for watering down the Brexit agreement during talks with a string of EU leaders in Washington over the next 48 hours.
The ex-premier warned 'the drift backwards has begun' and accused the new Labour Government of a 'lack of ambition and a failure to believe in this country's potential'.
Dyson has announced plans to axe 1,000 jobs in the UK. The manufacturer is well known for producing vacuums and air appliances, and was founded by British tycoon Sir James Dyson