Presidential hopefuls unite in condemnation of US president over Ukrainian scandal; Frontrunner Biden denies wrongdoing: 'My son did nothing wrong. I did nothing wrong'

Trump's Syria withdrawal could be criticized by candidates as endangering Israel, while Bernie Sanders' health likely to be scrutinized after heart attack

Spokeswoman says that 'based upon everything he has heard,' the president 'strongly condemns' clip in which he is seen stabbing and shooting press and political opponents

US president's re-election campaign denies connection to video of his likeness shooting and stabbing political rivals, members of the media at 'Church of Fake News'

Democratic presidential candidate speaks before appointment with a cardiologist, days after suffering heart attack

78-year-old presidential candidate hospitalized after suffering chest pains at election event in his 2nd health incident in recent months

Microsoft says attackers went after US government officials, journalists, dissidents, breached 4 of its customers' accounts

Tech giant declines to identify campaign, says owners of 4 accounts successfully breached have been notified

Vermont senator's wife says he's 'ready to get back out there' after heart procedure

Facing impeachment proceedings after asking Ukraine to probe his chief political rival, US president tells reporters Beijing should do the same