Donald Trump's border crackdown has resulted in the detention and deportation of tourists for minor infractions. Two German tourists were detained and deported for not having accommodation booked in Hawaii, while a British backpacker was locked up for nearly three weeks for allegedly having the wrong visa. The British government has warned that travellers could face arrest or detention if they fail to abide by US border rules. The crackdown has led to a decline in the number of visitors to the US, with preliminary figures showing a 14% drop in British travellers in March.