Republican presidential candidate Donald Trump has ruled out running again in the United States? 2028 presidential election if he loses in the November poll, according to an interview broadcast on Sunday.

Responding to a question on whether he would run again if he lost, the 78-year-old former president told US news programmeFull Measure: ?No, I don?t. I think that that will be, that will be it. I don?t see that at all.?

The billionaire did, however, say he hoped to be ?successful? at the ballot box on voting day onNovember 5.

Trump is currently neck-and-neck with Democratic candidate Vice-PresidentKamala Harris, including in the key battleground states that often decide close US elections.

The Democratic Party has seen resurgence in support after the withdrawal of PresidentJoe Bidenas its candidate in July, following a disastrous debate against Trump.

Trumplost to Biden in 2020 but refused to accept he was defeated, riling supporters by saying the election was ?stolen? and fuelling conspiracy theories.

On January 6, 2021, fervent Trump supporters stormed the US Capitol in an attempt, spurred by his allegations, to stop the certification of the election result.

The Republican has notably refused several times in recent months to commit to unconditionally recognising the result of the coming election. (AFP)