The FBI lifted the threat that Hillary Clinton could face charges over her emails, leaving White House rival Donald Trump to demand that U.S. voters punish her at the ballot box, AFP reports.
FBI Director James Comey unceremoniously closed down his probe into the former secretary of state's private server.
The decision came as a relief to the Democratic camp and Asian markets opened higher after a tense weekend in which it seemed the populist Republican might be close to a breakthrough.
But Trump came back fighting, and experts said the renewed scandal had already damaged the 69-year-old former first lady's chance of becoming America's first female president.
Clinton's lead dropped from 5.7 to 2.9 percentage points in the week since the scandal returned, according to influential data journalist Nate Silver of FiveThirtyEight.com.
Clinton has booked a star-studded roster of supporters — headlined by President Barack Obama and rock star Bruce Springsteen — for her final events on Monday.
But Trump is also touring key swing states and was determined not to let Clinton off the hook over her email, a symbol for his supporters of the corruption of the Washington elite, AFP says.
"The rank and file special agents of the FBI won't let her get away with her terrible crimes," Trump told a rally in Michigan, a state won comfortably by Obama in 2012.
"Right now she's being protected by a rigged system. It's a totally rigged system. I've been saying it for a long time," he declared, as his supporters chanted "Lock her up!"
"Hillary Clinton is guilty, she knows it, the FBI knows it, the people know it and now it's up to the American people to deliver justice at the ballot box on November 8."
