President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on early Wednesday said winning the Electoral College is "much more difficult & sophisticated" than winning the popular vote, slamming Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE for her campaign strategy.

“Campaigning to win the Electoral College is much more difficult & sophisticated than the popular vote. Hillary focused on the wrong states!” Trump wrote on Twitter.

"I would have done even better in the election, if that is possible, if the winner was based on popular vote - but would campaign differently," he added moments later, followed by: "I have not heard any of the pundits or commentators discussing the fact that I spent FAR LESS MONEY on the win than Hillary on the loss!"

Campaigning to win the Electoral College is much more difficult & sophisticated than the popular vote. Hillary focused on the wrong states! — Donald J. Trump (@realDonaldTrump) December 21, 2016

I would have done even better in the election, if that is possible, if the winner was based on popular vote - but would campaign differently — Donald J. Trump (@realDonaldTrump) December 21, 2016

I have not heard any of the pundits or commentators discussing the fact that I spent FAR LESS MONEY on the win than Hillary on the loss! — Donald J. Trump (@realDonaldTrump) December 21, 2016

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The Electoral College on Monday officially voted to make Trump president.

The result came despite the fact that Clinton got nearly 3 million votes more than Trump in the popular vote.

In the wake of the result — the fifth time in 58 U.S. presidential elections where the popular vote winner did not win the presidency — calls have grown for the nation to scrap the Electoral College and award the White House to the winner of the popular vote.

Wednesday marked the second day in a row that Trump took to Twitter in the early morning to attack Clinton’s campaign.

On Tuesday, he pushed back against former President Bill Clinton William (Bill) Jefferson ClintonEpstein podcast host says he affiliated with elites from 'both sides of the aisle' Ruth Bader Ginsburg lies in repose at Supreme Court Business groups start gaming out a Biden administration MORE's claim that Trump called him after the election, and added that Hillary Clinton's campaign "focused on wrong states."