File image of Republican Joe Walsh after speaking in Illinois, US. Walsh has announced he will challenge Donald Trump in 2020. File photograph: Peter Hoffman/The New York Times

Joe Walsh, a conservative former US congressman turned talk show host, on Sunday became the second Republican to challenge president Donald Trump for (...)

US senator Elizabeth Warren is due to formally launch her campaign for the Democratic presidential nomination to run against Donald Trump in 2020. Photograph: Alex Edelman/AFP/Getty Images

US senator Elizabeth Warren, days from formally launching her 2020 presidential campaign, has faced criticism for claiming she was Native American in (...)

File image of Steve Wynn in  Beverly Hills, California, US.  File photograph: Mike Blake/Reuters

Las Vegas casino mogul Steve Wynn has resigned as finance chairman of the Republican National Committee (RNC) amid allegations of sexual harassment an(...)

Republican politician Greg Gianforte, with his wife Susan, apologises for his actions towards Guardian reporter Ben Jacob following his election to the US House of Representatives. He has been charged with assaulting Jacob. Photograph: Colter Peterson/Reuters

Republican Greg Gianforte defeated a political novice to win Montana’s seat in the US House of Representatives on Thursday, barely 24 hours after he w(...)

A volunteer places programmes on chairs before the start of the Republican National Convention in Cleveland, Ohio, US. Photograph: John Taggart/Bloomberg

Donald Trump, the man and the uniter: that’s how the billionaire’s campaign team and the Republican apparatchiks plan to present the brash businessman(...)