Dollar strengthens as bets on Trump presidency rise post-debate

HONG KONG, China — The dollar rose Tuesday and Asia equities were mixed as investors weighed the possibility of another Donald Trump presidency after last week's poor debate performance by incumbent Joe Biden.

Speculation about a second term for the Republican rose on the Supreme Court's ruling that all former leaders had "absolute immunity" from criminal prosecution for "official acts" taken while in office but could still face criminal penalties for "unofficial acts".

The decision comes as Trump faces criminal charges over his attempts to overturn his 2020 election loss to Biden, but that trial had been put on hold while judges considered his immunity claims.

Bets on a second term for the controversial tycoon rose after Thursday's debate, in which he was widely considered to have come out on top after Biden struggled through answers and stumbled over his lines.

That led to calls for him to step down due to worries over his mental state, but Democrats have pushed back and are reportedly seeking a vote next month that would formally make him the party candidate for November's poll.

"Those two headlines, and given the reaction to President Biden's first debate, continue to suggest a Trump presidency is looking more likely at this stage," Tapas Strickland at National Australia Bank said in a commentary.

Observers said the prospect of another Trump presidency fuelled talk of tax cuts and a fresh spike in inflation, pushing up yields and denting hopes for interest rate cuts.

That, in turn, boosted the dollar against its main peers, pushing back to 38-year highs against the yen, putting Japanese authorities on alert after they previously warned they were ready to intervene in forex markets to support the unit.

The euro was also a little softer, though it managed to hold most of the gains made Monday in a relief rally that came after the far-right National Rally (NR) looked unlikely to win an absolute majority in French legislative elections as had been feared.

President Emmanuel Macron and his allies are now involved in intense campaigning and horse-trading ahead of the second round of polls Sunday as they look to deny NR an absolute majority and control of