Ayatollah Ali Khamenei, the supreme leader of Iran, expressed disappointment in the US presidential race on Wednesday.

The Muslim cleric suggested in a pair of tweets ahead of the final presidential debate Wednesday night between Hillary Clinton and Donald Trump that he was disenchanted with the issues being discussed in the run-up to November.

The race for the White House has turned increasingly ugly in recent weeks.

Clinton has zeroed in on Trump for his treatment of women. In return, Trump has raised Bill Clinton's history with women, trotting out before the media those who have accused him of sexual misconduct.