We will use your email address only for sending you newsletters. Please see our Privacy Notice for details of your data protection rights.

Sign up fornow and never miss the top politics stories again.

It is understood the meetings have taken place at Obama’s personal office on the third floor of the World Wildlife Fund building, and have included discussions on the future of the Democratic Party.

Mr Sanders, who lost to Hillary Clinton in the Democrats’ primaries, has more respect for Obama and his former administration than most believe, sources told Politico.

And it is understood the Democrat requested a meeting with the former president in mid-March.

Meanwhile Ms Warren has met with Mr Obama on at least two separate occasions since he left office in January 2017.

The first was in the spring of 2017 after Warren revealed she was “troubled” by the $400,000 Obama received after speaking at Wall Street investment firm.

She also met with the former US President for a 90-minute chat in April after she told CNN's Jim Acosta in March: ”I am not running for president in 2020.”