US President Donald Trump on Tuesday challenged Hillary Clinton to join the 2020 U.S. presidential race.

She lost to Trump in 2016 despite winning the majority of the popular vote.

Trump called on her to enter the race on condition that she gives an explanation regarding the notorious email scandal, Sputnik reports.

The emails he referred to in his tweets are related to an FBI investigation into Clinton, who used a private server and email accounts during her tenure as U.S. Secretary of State.

Clinton was accused of culling out some 30,000 of her personal emails without following the correct National Archives procedures.

The Clinton email saga, also known as emailgate, has followed Clinton for many years.

In 2017, materials handed over to Judicial Watch by the State Department revealed examples of what appeared to be `pay-to-play’ politics.

It was alleged that Clinton would receive generous donations to the Clinton Foundation from private and state donors in exchange for government appointments, policy positions, and government contracts.