On 14 March 2020, Ardern announced in response to the COVID-19 pandemic in New Zealand that the government would be requiring anyone entering the country from midnight 15 March to isolate themselves for 14 days. She said the new rules will mean New Zealand has the "widest ranging and toughest border restrictions of any country in the world". On 19 March, Ardern stated that New Zealand's borders would be closed to all non-citizens and non-permanent residents, after 11:59 pm on 20 March (NZDT). Ardern announced that New Zealand would move to alert level 4, including a nationwide lockdown, at 11:59 pm on 25 March
On 14 March, President Trump expanded the travel ban on Europe to include the United Kingdom and Ireland. In addition, a representative of the insurance industry clarified that, contrary to the president's statement, major health insurers had only agreed to waive co-payments for coronavirus testing, and not for coronavirus treatment, which is far more costly.