Peacock and his American-born third wife retired to Austin, Texas, where she had gone to university. He visits Australia regularly and does not intend to become a U.S. citizen, although he holds a green card. He gave up drinking after moving to the U.S., after experiencing heart problems. Peacock supported Donald Trump in the 2016 U.S. presidential election, after originally supporting Marco Rubio in the Republican primaries. He placed a bet on Trump to become president even before the first primary, at odds of 16–1. In a January 2018 interview with the "Australian Financial Review", he said he was "disquieted by the first year's performance", praising Trump's tax cuts but expressing his disappointment with Trump's decisions to withdraw from the Trans-Pacific Partnership and recognise Jerusalem as the capital of Israel. According to Peacock, his wife is a staunch conservative and regards him as "the most liberal person she's ever met". He has expressed dismay at the disappearance of moderate Republicans, and the general polarisation of American politics.