US President-elect Donald Trump has reprised his election campaign attacks on Hillary Clinton, declaring her "guilty as hell" and deriding her supporters' criticism of how the FBI handled an investigation into her emails.
The US Justice Department said on Thursday it would investigate an FBI decision to announce an inquiry into Ms Clinton's emails shortly before the November 8 election, a move she has blamed as a factor in her defeat.
"What are Hillary Clinton's people complaining about with respect to the FBI? Based on the information they had, she should never have been allowed to run - guilty as hell," Mr Trump wrote on Twitter.
"They were VERY nice to her. She lost because she campaigned in the wrong states - no enthusiasm!"
Mr Trump had often led crowds in chants of "lock her up!" during the 2016 election campaign, accusing Ms Clinton of illegal conduct over her use of a private email server for official correspondence while she was secretary of state under President Barack Obama.
In a debate in October, the Republican real estate developer vowed Ms Clinton would "be in jail" over the matter if he became president, but later said he would not pursue prosecution.
Some of the Clinton emails were determined to contain classified information. The FBI ultimately decided not to refer her case for prosecution.
Democrats said FBI Director James Comey's announcement of the new inquiry into the emails damaged her standing with voters right before the election, and he faced complaints that his moves were politically motivated.
Brian Fallon, Ms Clinton's spokesman, told MSNBC on Thursday that Mr Comey's actions "cried out for an independent review."
Mr Trump, who will be sworn in on January 20, will not have the power to dismiss the investigation.
Trump dossier author long gone from MI6
British Prime Minister Theresa May said the person who wrote reports containing details of compromising material Russia allegedly collected on US President-elect Donald Trump has not worked for the British government for years.
"It is absolutely clear that the individual who produced this dossier has not worked for the UK government for years," May said at a news conference on Friday.
The author of the dossier has been named as Christopher Steele, a former MI6 officer who once worked under diplomatic cover in Russia. Steele has so far not commented.