While Barack Obama has been holding secret meetings with potential 2020 challengers to Donald Trump and fundraising for Democratic candidates ahead of midterm elections, some of his backers aren't satisfied with his lead as of late.

Left-wing strategists, supporters and aides to the former US president are urging Obama to return from the sidelines and take on a stronger role in the midterm election fight.

A political strategist told The Hill this week: 'There’s f**king no one else... Bill Clinton is toxic, Carter is too old, and there’s no one else around for miles.

'The desire among Democrats for Obama to take a more leading role in the midterm fight and party building in general is just getting stronger, particularly with the lack of alternatives.'

Trump's predecessor's political group, Organizing for Action, has been actively working to create the anticipated outcome of a 'blue wave' for midterm elections in early November.

Left-wing strategists, supporters and aides to former US president Barack Obama are urging him to take stronger lead in the midterm elections. Obama is pictured above in Chicago in May 2018

One political strategist told The Hill: 'There’s f—ing no one else... Bill Clinton is toxic, Carter is too old, and there’s no one else around for miles.' Above: (L-R) Rep. John Lewis, former president Jimmy Carter and former president Bill Clinton are seen in Washington in August 2013

Obama's political group, Organizing for Action, has been working to create the anticipated 'blue wave' outcome for midterm elections. Obama is seen above in Washington, D.C. in April 2015

The group, erected during Obama's campaign operation, said in a statement they aim to defeat Wisconsin Governor Scott Walker, elect a Democrat to succeed House Speaker Paul Ryan and flip control of the state Senate,' according to the Associated Press.

The nonprofit organization has targeted 27 House races since the beginning of the year.

Although the organization is Obama-led - he doesn't hold an official title - as the group is largely run by aides and strategists.

While speaking to The Hill, one Obama bundler said the former president has been too quiet during a time of need for the Democratic party.

'There are a lot of people who think he’s played too little a role or almost no role in endorsing or fundraising and he’s done jack shit in getting people to donate to the party,' the individual said.

Obama has been holding secret meetings with potential 2020 challengers to Donald Trump. This includes Vermont Senator Bernie Sanders, seen above in February 2016 in New Hampshire

Massachusetts Senator Elizabeth Warren has also reportedly met with Obama. Warren is seen above in February 2015 in Washington, D.C.

A former Obama aide added: 'He always wanted to help, without a doubt. He cares tremendously about our country and our party.

'But I think he always intended to be a little more on the sidelines than he’s been. I think he realizes he is needed and needed badly.'

Obama, recently, has been hosting top-secret meetings with as many as nine potential presidential candidates.

The sessions have been held in Obama's personal office located on the third floor of the World Wildlife Fund building in Washington D.C., Politico reported.

The would-be contenders got one-on-one talks with the former commander-in-chief.

Obama remains close to his former Vice President Joe Biden. The two talk on the phone often and Biden will reportedly make a decision about running for president after the 2018 election. Biden is seen above in October 2012 in Kentucky

Former Massachusetts Democratic Governor Deval Patrick has met with Obama and sits on the board of his foundation. He is seen above in Massachusetts in September 2009

Potential candidates include Senator Bernie Sanders, Senator Elizabeth Warren, former Vice President Joe Biden and former Massachusetts Governor Deval Patrick.

Obama, who has been reluctant about any information regarding the meetings getting leaking to the public, has not promised to support any of the said candidates.

He refused to endorse anyone until a nominee takes lead in the upcoming race.

And while he has been reluctant to be a public face of the Democrats, privately, he is fundraising for the Democratic National Committee.

Obama has appeared at fundraisers for senators such as Claire McCaskill of Missouri, who is in a tough race this year.

The former president has also met with other prominent Democrats like former Senate Democratic Leader Harry Reid.

He speaks regularly to Senate Democratic Leader Chuck Schumer and House Democratic Leader Nancy Pelosi.