US President Donald Trump has said he will do other things if he loses in the November presidential elections to his Democratic opponent, Joe Biden, without giving details of these matters.

"If I don't win, I will go ahead and do other things," Trump said in a television interview with "Fox News" Friday, after his Democratic opponent, Joe Biden, said the Republican president might cheat and refuse to leave the White House.

Trump has not specifically said that he will accept the election result in the form of defeat, but his statements to the news channel indicate this, which was said by Trump campaign spokesman Tim Morto on Thursday that the president would accept the result.

As the competition between Trump and Biden intensifies ahead of the election, the two rivals are increasingly exchanging hints that the other side is determined to cheat to win.

Biden, who leads Trump in most opinion polls at the national level in the past days, said he was concerned that Trump would try to "steal" the elections, but he was confident that the army soldiers would accompany Trump from the White House if he lost and did not admit the outcome.

Trump, for his part, said Democrats are targeting the use of an increase in mailing as a way to rig the elections, while Biden pledged to deploy attorneys at polling stations nationwide to monitor Republicans ’efforts to rig the vote.

An increase in mail voting is expected due to concerns over the Coruna virus epidemic, and experts warn that the process may be as chaotic as what actually happened in the primary elections in the states.

The large numbers of votes that voters cast in the mail and that they do not arrive or be counted in time may lead to legal challenges to the election result.

Mailing of votes takes longer to verify the identity of the voter first, which raises the possibility that the election results will be announced long after the voting day, experts say.