Donald Trump has endorsed Japan's Prime Minister Sanae Takaichi ahead of a snap election in her country on Sunday.

Takaichi has "already proven to be a strong, powerful, and wise leader... one that truly loves her country," the US president wrote in a Truth Social post on Thursday, adding: "She will not let the people of Japan down!"

While it is rare for US presidents to publicly back candidates in foreign elections, Trump has done so before, endorsing Argentina's Javier Milei and Hungary's Viktor Orban most recently.

Takaichi has courted the US president as Tokyo seeks more stability in its relationship with Washington, its closest ally, in the wake of Trump's tariffs.

Trump had threatened a 25% tariff initially, but Japan then struck a deal in July to invest $550bn (£407bn) in the US. In exchange, Washington lowered import levies to 15%.