Nikki Haley: 'Republicans have lost the popular vote in seven of the last eight presidential elections. That has to change.' Photograph: Taylor Glascock/New York Times Nikki Haley, the former governor of South Carolina and Donald Trump’s one-time ambassador to the UN, has become the first Republican to challenge the former president for the party’s nomination for president in 2024. Ms Haley announced her candidacy for president in a video posted on social media platforms on Tuesday. In the three-minute video, Ms Haley (51) did not mention Mr Trump by name, but said it was “time for a new generation of…