Donald Trump has claimed he would have won the US popular vote were it not for the "millions of people who voted illegally" amid claims over the legitimacy of his election victory.
The President-elect criticised the decision to hold a recount in Wisconsin, calling it a "waste of time" as his aides hit back at speculation over the electoral process.
In a series of tweets, he quoted Hillary Clinton about the need to respect the result of the election, before adding: "In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally."
Mr Trump had warned before the election that the result might be "rigged", but did not repeat the claim after his unexpected victory on 8 November.
He did not offer any evidence to back up his claim, and did not explain why he opposed the Wisconsin recount if illegal voting was a serious problem.
Election observers have not pointed to any widespread fraud.
Mr Trump's top aide, Kellyanne Conway, hinted on Sunday that if Mrs Clinton's team pushed too hard in Wisconsin, he might rethink his vow not to seek prosecution for the former secretary of state over her use of a private email server.
The recount was requested by Green Party candidate Jill Stein - who received a tiny part of the total vote. But Mrs Clinton's campaign has said it would join the process.
Marc Erik Elias, a lawyer for Mrs Clinton, said in a post on Medium.com on Saturday that the campaign would also participate in recounts in Michigan and Pennsylvania if they were arranged.
Election experts do not think the outcome of the election could be reversed as Mrs Clinton trailed by several thousand votes in each state.
Mr Trump won Michigan, Pennsylvania and Wisconsin by a total of just over 100,000 votes.
The billionaire has seen signs of discord over his picks for his cabinet, particularly the position of secretary of state which is said to be between 2012 Republican presidential nominee Mitt Romney and former New York mayor Rudy Giuliani.