Clinton's camp is backing Jill Stein's campaign for the Wisconsin recount

He s aid 'millions' of 'illegal' Clinton votes cost him the popular vote

The statement comes amid growing acrimony over a recount in Wisconsin

Trump will be inaugurated as America's 45th president on January 20

Donald Trump sported a reminder of his looming role as America's 45th president on Sunday as he left Mar-a-Lago for New York

His shock election win is freshly etched in the memory of all Americans, let alone the rest of the world.

But Donald Trump reminded everyone of his looming inauguration as 45th president of the United States on Sunday.

The 70-year-old traded in his trademark MAGA cap for another red number which bore the number 45 on the side.

Its front was simply emblazoned 'USA' in white stitching. Trump was on his way back from his Mar-a-Lago resort in Palm Beach, Florida, when he was spotted wearing the hat.

The president-elect boarded his Boeing 757-200 with wife Melania and son Barron in tow in the afternoon, landing in New York some hours later.

His motorcade was seen arriving back at Trump Tower, his Fifth Avenue bolthole, in the evening. Trump will resume assembling his administration from the Manhattan refuge this week.

The businessman's Make America Great Again hats were a staple throughout his campaign and were embraced wholeheartedly by his followers.

They became the model for ornaments sold by online retailers and are still available to purchase in a variety of colors.

It's not clear if his newest wardrobe addition was a gift or a product of his campaign.

The garment did little to distract from growing acrimony between Trump and the candidates he defeated who are calling for a recount in three crucial states where he won.

He wore the hat for his journey back to New York with wife Melania and 10-year-old son Barron, both of whom dressed in Republican red

It was a break from his trademark Make America Great Again cap, variations of which have been a staple throughout his campaign for the White House

Trump lashed out on Twitter on Sunday after Hillary Clinton's camp threw its weight behind a crusade launched by the Green Party's Jill Stein to have votes in Wisconsin, Pennsylvania and Michigan looked at again.

He accused the media of ignoring 'serious' voter fraud by 'millions' of Clinton fans whose dishonest ballots cost he believes cost him 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 said after landing in New York.

Earlier, he told fans in a flurry of three posts: '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.

'It would have been much easier for me to win the so-called popular vote than the Electoral College in that I would only campaign in 3 or 4 states instead of the 15 states that I visited.

'I would have won even more easily and convincingly (but smaller states are forgotten)!' he said.

The hats were embraced by Trump fans as much as by the president-elect himself who finished otherwise formal looks with them throughout the race for the White House

Stein launched an online appeal to raise enough money to pay for recounts in the three states last week after material surfaced in which experts suggested electronic voting machines in each were susceptible to cyber attack.

Within 48 hours of asking for the money, she had raised $5million and petitioned Wisconsin, whose deadline for the demand was the earliest of the three.

The state's elections commission bowed to her request and announced plans to start recounting votes next week provided it received full payment of an as yet uncalculated fee.

Pennsylvania has until November 28 to receive petitions for recounts while Michigan's deadline is November 30.

On Sunday evening, the president-elect doubled down on his claims of fraud and accused the media of ignoring 'serious' cases of it in Virginia, New Hampshire and California

He earlier dashed off a trio of tweets that suggested Hillary Clinton won the popular vote due to widespread voter fraud

Green Party candidate Jill Stein (left) launched a crusade to have votes recounted in three states. Hillary Clinton initially shied away from the subject but her camp threw its weight behind it once the Wisconsin Elections Commission bowed to Stein's petition on Friday

The Wisconsin recount must be completed by December 13 to comply with regulations.

Stein was trounced in all three states and has no hope catching up. Clinton, on the other hand, could technically win the electoral college if all three swing in her direction which experts said is unlikely.

The former secretary of state kept quiet on the issue as Stein made public pleas for more funds. Her lawyer finally backed the efforts on Saturday after Wisconsin announced it would go ahead.

'Now that a recount has been initiated in Wisconsin, we intend to participate in order to ensure the process proceeds in a manner that is fair to all sides,' lawyer Mark Elias said in a post for Medium.