The upset makes him the first Democrat in the state to be elected to the Senate in 25 years and reduces the Republicans' majority in the chamber to just two seats.

The result increases the chances of the Democrats retaking the chamber in next year's congressional elections.

Ahead of polls Jones had said: "I want to bring the hope of justice and fairness back to all Alabamians. I want to be a voice for reason in the turmoil of modern Washington. Too many Alabamians don’t believe that our government is serving them. The issues that affect our daily lives – healthcare, wages, true equality for all – have become bargaining chips between parties."

The 1954 born is a lifelong resident of Alabama who had served as the United States Attorney for the Northern District of Alabama beginning in 1997.

The campaign for the election  was marked by accusations of sexual misconduct against Republican candidate Roy Moore.

His defeat is a blow to Donald Trump, who endorsed Moore.

Incensed at Moore's defeat, Trump fired off a tweet Tuesday night, saying Republicans will eventually 'have another shot' at Alabama's Senate

"Congratulations to Doug Jones on a hard fought victory. The write-in votes played a very big factor, but a win is a win," the president wrote.

"The people of Alabama are great, and the Republicans will have another shot at this seat in a very short period of time. It never ends!"

Daily Mail has quoted White House sources as saying that  Donald Trump is 'really upset' over Senate election loss for Roy Moore.