Gingrich apologised on Twitter after President-elect Donald Trump tweeted the phrase was still in use.
President-elect's former campaign manager gets top cabinet-rank post in new administration.
The congressman took a different stance to President-elect Trump, who has downplayed Russian involvement.
President-elect's adviser Newt Gingrich says Trump supporters 'tired of hearing this stuff'.
Obama said she would support the president-elect but could not bring herself to use his name.
Clinton campaign has blamed FBI Director James Comey for destroying her election chances.
The president-elect surpassed the 270-vote threshold when Texas electors cast their ballots.
The damaging emails from Podesta's personal account were steadily released by WikiLeaks until Election Day.
Kellyanne Conway says Obama is 'under political pressure' to take tough stance against Russia.
Only 7% of Democrats share the mistaken notion that Trump garnered the most votes.
The US attorney general acknowledged that it gave people 'a reason to think differently'.
There are fears the president-elect's comments will further damage US relations with China.
The president-elect said he didn't believe Obama meant what she said.
The president-elect said his audiences were more mellow since they won the US election.
'Whatever they do to us, we can potentially do to them,' Obama said.
The president questioned why people were 'acting surprised' that hacking disadvantaged the Democrat.
The political strategist had been slammed for insinuating a mother should not have a White House role.
President Obama has attempted to play down fighting between the teams.
Getty Images photojournalists from around the world tell IBTimes UK the stories behind some of the most widely-used images of the year.
Safra Catz was one of several top tech executives who recently attended a meeting with President-elect Donald Trump.
'We've focused our efforts on the worst of the worst,' the company said.
The breach by a Russian-speaking hacker was discovered by security firm Recorded Future.