Theresa May flies into a nervous New York this afternoon and will use some of her time here to urge US business leaders not to pull out of Britain - as we pull out of the EU.
She is in the city - days after the explosion which injured dozens of people - for her first United Nations General Assembly.
But while her official programme is centred around the UN and the international action on refugees, she will also host some big US investors.
'A million people in the UK wake up and go to work for an American company,' Mrs May told us on the plane from London to New York and she intends to tells the bosses of these big companies to keep their investments and their offices in the UK.
This is a particular issue for financial service companies who fear they will no longer be able to do business across the EU after the UK leaves.
'Passporting' allows companies to use London as a hub for operations across the single market - so they can continue to serve clients in EU countries.
Many firms are worried that our withdrawal from the EU could put this business at risk.
The Prime Minister will meet senior leaders from companies Amazon, Goldman Sachs, IBM and Morgan Stanley.
There will also be a reception in New York tonight for both US and British companies.
Mrs May may find she will have to explain the views of her International Trade Secretary Liam Fox who recently told UK bosses that they had become 'lazy' by failing to increase the exports of British goods.
Theresa May said she was 'aiming to get the right deal' for the country from her negotiations with the EU.