Political analysts say Trump's meddling in the election contributed to a more polarised debate, by reinforcing each side's convictions, but overall it was not expected to influence the result.
His last message "demonstrates the way the Trump administration insists on interfering in other countries' elections", Danish political scientist Ulrik Pram Gad told AFP.
"But already, after Germany (where Trump's close supporter Elon Musk is backing the far-right AfD party) they should have learned that it's not serving them well," he said.
"The sender of the message is not appealing to the one for whom the message is intended."