New York, Oct 23 (TIWN) US President Donald Trump and his challenger Joe Biden will face-off on Thursday night for the final debate with a microphone muzzle setup to cut off interruptions, which has been criticised by Trump as "unfair".

The debate, 12 days before the November 3 presidential elections with the Democratic candidate ahead in the polls, will focus entirely on domestic issues, save for national security which could touch on international issues but not directly deal with it.

Trump's constant interruptions during the debate last month led the Commission on Presidential Debates to announce that the microphones of the person who does not have the floor will be muted.

At one point during the last debate, an exasperated Biden told Trump, "Would you shut up, man."

"I think the mute is very unfair," Trump said on Wednesday, adding, "But that's my life."