Republican rival questions Donald Trump’s mental fitness

Former President Donald Trump speaks during a campaign event in Manchester, New Hampshire (Matt Rourke/AP)

Republican presidential candidate Nikki Haley has questioned whether Donald Trump is mentally capable of serving a second term after he repeatedly seemed to confuse her with former US House speaker Nancy Pelosi.

As she campaigned in Keene, New Hampshire, on Saturday, Ms Haley referenced Mr Trump’s speech the night before, in which he mistakenly asserted she was in charge of Capitol security on January 6 2021, when a mob of the former president’s supporters stormed the building seeking to stop the certification of his loss to Democrat Joe Biden.