Obama made the comments on Thursday at Miami Gardens, Florida, during a rally in support of Democratic presidential candidate Hillary Clinton.

"That is dangerous because when you try to sow the seeds of doubt in people's minds about the legitimacy of our elections, that undermines our democracy," Obama said.

"You're doing the work of our adversaries for them because our democracy depends on people knowing that their vote matters. That those who occupy the seats of power were chosen by the people," he added.

With the presidential election less than three weeks away, Trump has intensified his criticism of the American electoral system.

On Thursday, the GOP nominee said he will have the right to challenge the outcome of election if he feels it’s questionable. Hours later, Trump added fuel to the fire by saying that he would totally accept the results of presidential poll if he won.

According to a new poll released on Monday, 41 percent of American voters are saying the 2016 election could be "stolen" from Trump due to widespread voter fraud.

During his speech, Obama also condemned Republican lawmakers for taking too long to withdraw their support for Trump, doing so only after the release of the 2015 tape where Trump was caught making lewd comments about women.

"Apparently that was the deal breaker for them. Or at least, his poll numbers dropping after the tape came out was the deal breaker for him," he said. "But here's my question: Why would it take you this long to figure out that Donald Trump shouldn’t be president?"

“You stand up and nominate and support a guy who says that he would silence reporters, jail his political opponent in the middle of a debate, deport whoever he wants," he said.

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