If he's this essential to the US "national interest", they're welcome to him:
Nigel Farage exempt from US travel ban under 'national interest' clause ahead of Trump rally
US officials have exempt Nigel Farage from the country’s travel ban under the “national interest” clause, as Donald Trump prepares to hold his first major campaign rally since the outbreak of the coronavirus pandemic.
Despite the Foreign Office still advising all British nationals “against all but essential international travel”, the Brexit Party leader posted a photograph of himself on Saturday with the caption: “In the USA, only twenty four hours from Tulsa”.
After conducting a thorough review of the relevant facts and circumstances, DHS determined Mr Farage’s travel to be permissible under section 2 (a)(xi) of the presidential proclamation: any alien whose entry would be in the national interest, as determined by the secretary of state, the secretary of homeland security, or their designees authorising Mr Farage to board his flight”.