Donald Trump has had a change of heart about the Electoral College, just days after saying he would rather see a popular-vote election in the future.

'The Electoral College is actually genius in that it brings all states, including the smaller ones, into play. Campaigning is much different!' the president-elect tweeted Tuesday morning.

Trump said Sunday on '60 Minutes' that he 'hated' the Electoral College system, in which small states have influence on the result in proportion with their representation in Congress.

'I'm not going to change my mind just because I won,' he insisted in the interview, aired just two days ago and recorded on Friday.

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Interview: 'I'm not going to change my mind just because I won,' he insisted in the 60 Minutes interview aired just two days ago.

Volte face: On Tuesday he tweeted that the electoral college was 'genius' - but that he'd have won a popular vote anyway

'But I would rather see it where you went with simple votes. You know, you get 100 million votes and somebody else gets 90 million votes and you win.'

Trump prevailed on electoral votes last week but lost the national popular vote to Hillary Clinton by more than 600,000 votes, the largest margin in history for a presidential election with a split result.

But he won the popular vote overall in battleground states where both major-party nominees campaigned aggressively.

Trump reinforced that outcome in a second tweet Tuesday morning, suggesting he could have won more Americans' votes than Clinton if he had been forced to work within a strictly democratic process.

'If the election were based on total popular vote I would have campaigned in N.Y. Florida and California and won even bigger and more easily,' he wrote on Twitter.

As he was: This was Trump's view on election day in 2012, which saw Barack Obama win comfortably in the electoral college

Popular appeal: Post-election commentary has focused on how Trump got his voters out whereas Clinton bombed in public appearances

A large majority of Trump's campaign appearances in California, New York and Texas, states with outside populations, came in conjunction with fundraisers.

Florida, North Carolina, Ohio and Pennsylvania, however – states whose electoral votes he desperately needed – saw him visit over and over again purely to generate enthusiasm among his voting base.

The future president has vented before about the presidential selection system outlined in the U.S. Constitution.

Four years ago on Election Day, less than an hour after President Barack Obama secured his re-election, he tweeted that '[t]he electoral college is a disaster for a democracy.'