Donald Trump says he recorded a YouTube endorsement of Benjamin Netanyahu for re-election because the Israeli prime minister asked him to.

Trump tells Shalom TV that Netanyahu called and asked if he would "do an ad or a statement" to support his campaign in next week's Israeli parliamentary election.

The real estate tycoon said in Friday's interview that Netanyahu is a "great man and a great prime minister."

Polls suggest Netanyahu is poised to win Israel's elections next week and continue in office.