I'm hoping someone on here has a UK spouse too and can answer my question. Because I'm married to Cynthia, can I stay in the US long term, or am I still limited to a maximum of six months before good old Donald kicks me out?
Can anyone here help me, or at least point me in the right direction?
Visitors to the US on the ESTA (visa waiver program) only get up to 90 days at a time in the US, not 6 months. The only way you can have 6 months is if you apply for and are issued a B2 visitor visa... however, you can only get one if you are not eligible for the ESTA.
Just being married to a US citizen doesn't get you any benefits when visiting the US - you still only get 90 days.
In order to actually move to the US and live there long-term, you would need to apply for a US spousal visa from the US Embassy in London. Your wife would need to meet a minimum income requirement (that she earns at least 125% above the poverty line), but a third-party co-sponsor (friend or family member in the US) can help out.
A US spousal visa takes anywhere from about 6-10 months to be processed and issued. First she would need to file a petition in the US to sponsor your visa, which takes usually about 3-5 months to be approved, and then you would need to attend a visa interview in London, and have a medical exam in London too (costs about £250 for the medical). Ideally, you want to start the application process about 10 months before you wish to move to the US.
Where do you both live now (when you aren't touring around Europe, where's your permanent base)? Are you living in the same country together, or doing long-distance?