Some 8.5 million visitors are expected to visit the resort, on the site of a former brickworks near Bedford, in its first year
Foreign Secretary David Lammy said he expected Sir Keir Starmer to make an early trip to Washington.
Sir Keir Starmer declined to say the Chancellor would remain in post until the election.
Foreign Secretary David Lammy said: ‘We will not be bringing her back to the UK. We’re really clear about that.’