US President Barack Obama has said Donald Trump’s “continued flattery” of Russia’s president and claims of election rigging are “unprecedented”.
At a White House press conference, Mr Obama said he has never seen any US presidential candidate try to discredit a poll before it has even taken place.
“I’d advise Mr Trump to quit whining,” Mr Obama added.
The Republican candidate has repeatedly claimed the 8 November election will be stolen for Hillary Clinton.
“Mr Trump’s continued flattery of Mr Putin and the degree to which he appears to model much of his policies and approach to politics on Mr Putin is unprecedented,” Mr Obama said at Tuesday’s Rose Garden news conference, alongside visiting Italian Prime Minister Matteo Renzi.
Mr Trump, who has made several admiring remarks about Vladimir Putin, said on Monday he would consider visiting Russia before taking office, if elected.
The businessman told a talk-radio host: “If I win on November 8, I could see myself meeting with Putin and meeting with Russia prior to the start of the administration.”