US President-elect Donald Trump has pledged to put America first in his second term – but his domestic health agenda could impact those beyond his own country. Public health became an unlikely hot topic in the waning days of the US election, with Trump saying he would let Robert F Kennedy Jr – a prominent vaccine sceptic, environmental lawyer, member of the Kennedy political dynasty, and presidential hopeful turned Trump ally – “go wild” on federal health agencies in a bid to “make America healthy again”. Trump is notoriously unpredictable, so it’s not clear exactly how far the duo will go, bu…