Visiting Non US citizens flying 103 in the USA

[martymayes]

Now i have a person here in OZ that insists i should get the same Homeland Security clearance that a GA pilot or student or LSA pilot requires before they can undertake any flight or instruction. I believe that all i require is the usual security check (ESTA) that is to be obtained before arriving in the USA.
Who would i need to ask? Could someone please point me in the right direction.

Simply read the rules. There is absolutely nothing in Part 103 that requires the 'occupant' of an ultralight to be a US citizen.