President-elect Donald Trump has lashed out on Twitter, criticizing CNN as he faces questions about his unsubstantiated claims of voter fraud.

Trump retweeted a string of messages on Monday night from supporters over voter fraud allegations.

The tweets were critical of a CNN reporter who dismissed the accusations calling them 'blatant and baseless'.

'CNN is so embarrassed by their total (100%) support of Hillary Clinton, and yet her loss in a landslide, that they don't know what to do,' he wrote.

Trump was still upset about the report that he continued the Twitter tirade Tuesday morning, writing: 'I thought that CNN would get better after they failed so badly in their support of Hillary Clinton however, since the election, they are worse!'

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President-elect Donald Trump has lashed out on Twitter criticizing CNN as he faces questions about his unsubstantiated claims of voter fraud

Trump continued his Twitter tirade Tuesday morning, writing that CNN's reporting has only gotten 'worse' since the election

Trump has responded to a recount effort by arguing that illegal voting happened in the November election, but he has offered no proof.

He has singled out Virginia, California and New Hampshire, but there has been no indication of widespread election tampering or voter fraud in those states or any others.

There has however been no form of official investigation into the allegations.

The President-elect claimed on Twitter on Sunday that he would have won the popular vote if it were not for 'the millions of people who voted illegally.'

'In addition to winning the Electoral College by a landslide, I won the popular vote if you deduct the millions of people who voted illegally,' he said.

Trump retweeted a string of messages on Monday night that were critical of a CNN reporter who called the accusations of voter fraud 'blatant and baseless'

Donald Trump (above on Sunday leaving Palm Beach, Florida) claimed millions of people 'illegally voted' for Hillary Clinton and tweeted that he could have won the popular vote

'Serious voter fraud in Virginia, New Hampshire and California - so why isn't the media reporting on this? Serious bias - big problem!' he followed up later.

It was the latest in a string of outbursts since Clinton's camp joined Green Party candidate Jill Stein in her efforts for a recount in three major electoral college states: Wisconsin, Pennsylvania and Michigan.

Trump, who spent the campaign warning that the result might be 'rigged,' is now pushing back hard as Stein works to secure recounts in three states he won.

The Green Party were granted a statewide recount in Wisconsin on Friday and plans to formally request a recount in Michigan on Wednesday.

He boarded his personal plane with wife Melania and 10-year-old son Barron after a four-day break in Florida where he spent Thanksgiving