PORTSMOUTH - US Republican presidential nominee Donald Trump, fighting to overcome setbacks and polls showing a tough path to the White House, on Saturday doubled down on his claim that the US election is rigged against him.Trump challenged accusations from several women that he made unwanted sexual advances toward them. Trump spokesman Jason Miller denied a new allegation that surfaced on Saturday, saying there was "no way" Trump had kissed a woman without permission 20 years ago at his Florida resort.Trump told an outdoor rally in New Hampshire on Saturday that the media was sharing the accusations against him to boost Democrat Hillary Clinton and damage his own White House hopes.Trump has presented no evidence for claims he has made for months that the election could be fixed to prevent him from reaching the Oval Office. Leaders on both sides of the political spectrum worry that this rhetoric, which supporters sometimes repeat in interviews, undermines the democratic process."It looks to me like a rigged election," Trump said in New Hampshire. "The election is being rigged by corrupt media pushing completely false allegations and outright lies in an effort to elect her president."He started the day tweeting several times that the election was being swayed by a media conspiracy."This election is being rigged by the media pushing false and unsubstantiated charges, and outright lies, in order to elect Crooked Hillary!" he said in one Twitter post. He reiterated similar claims at a later rally in Bangor, Maine.Clinton, a former US secretary of state, led Trump by seven percentage points in the most recent Reuters/Ipsos national opinion poll of voters. A new analysis found she was heavily favored to reach the 270 Electoral College votes needed to secure the presidency.