Nikki Haley, the US Ambassador to the UN, will present "irrefutable evidence" that Iran has violated the Iran deal, according to her office.

Haley will go after Iran for allegedly providing missiles to Houthi rebels fighting in Yemen.

Iran denies it has armed the Houthis and has dispatched its top diplomat to Europe to get Europeans to side with them over the US.

US Ambassador to the UN, Nikki Haley, will present "irrefutable evidence" that Iran has violated the Joint Comprehensive Plan of Action, or the Iran deal, at a press conference on Thursday.

Haley will demonstrate "Iran has deliberately violated its international obligations and has tried and failed to cover up these violations‎," according to a press briefing on the US mission to the UN's website.

Haley's conference comes after President Donald Trump decertified the Iran deal on October 13, leaving it in place practically but testifying that it was not in the US's national security interests to continue the deal.

Trump's decertification set off a 60-day period for Congress to decide whether or not to reimpose sanctions on Iran, which it declined.

Haley will update the UN on the implementation of the Iran deal in a regularly scheduled report, which ABC News said will delve into accusations that Iran provided arms to Houth rebels fighting against the internationally recognized government of Yemen.

This in itself does not necessarily contravene the deal, however, as the agreement does not explicitly forbid ballistic missile production or distributing arms.

As part of the "ongoing destabilizing activities in the Middle East" Haley will raise, ABC reports she will discuss the US and Saudi Arabia accusations that Iran of provided ballistic missiles and possibly drones and other weapons systems to the Houthis.

Iran denies it has armed the Houthis. It has responded with vitriol to Trump's moves to decertify the deal while dispatching its chief diplomats to Europe to shore up ties with other members of the Iran deal.

A non-binding part of the Iran deal forbids Tehran from building ballistic missiles capable of carrying nuclear warheads.