"One of the things we're learning is it is always good -- it's old-fashioned, but it's always good to have a paper backup system of voting. It's called paper, not highly complex computers paper," Trump told reporters at a joint news conference with the visiting Swedish Prime Minister Stefan Lofven.
A lot of states are doing that, he said.
"They're going to a paper backup and I think that's a great idea. But we're studying it very closely," Trump said.
Trump said he is not worried about Russian interference in the US election.
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"No, because we'll counter act whatever they do. We'll counteract it very strongly. And we are having strong backup systems," he said.
"We haven't been giving credit for this, but we've actually been working very hard on the '18 election and the '20 election coming up," he said.
Trump said the Russians had no impact on American our votes whatsoever.
"But, certainly there was meddling, and probably there was meddling from other countries, and maybe other individuals," he said.
"We are going to do very well in the '18 election, although historically those in the White House have a little bit of a dip. But I think we're going to do well because the economy is so good, and because we're protecting our job, like our jobs are being protected, like with what we are doing with the tariffs," he said.
Lofven said he and Trump agree that the result of the election in the country should be decided by nobody else but the voters in that country.
"That is also our clear stance, and that is why our intelligence agencies are now also increasing their capacity to detect and counter, whether it's hacker attacks or financing, or producing, or spreading propaganda, whatever it is; we are increasing our capacity to handle that," Trump said.
"We are cooperating with other European union countries. Some of our agencies are also cooperating with American counterparts, and will continue to do. Any foreign power that believes that they can interfere with our election, we will find out, and we will call them out very clearly, loud," the Swedish Prime Minister said.