Former President Obama is expected to stump for Democrats on the campaign trail starting in September, CNBC reported Thursday.

The news outlet reported that Obama will work with House Minority Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) and Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) to provide a boost to Democratic candidates in this year’s midterm elections.

Two sources told CNBC that the former president will hit the road in September, while another source said the timing and locations have not been determined.

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Schumer told The Washington Post earlier this month that Obama has been “very amenable” to offering assistance in the midterms. The former president has fundraised for Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.), and endorsed Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE (D-Calif.) in her primary race.

Democrats are seeking to regain control of the House, and hang on to a number of vulnerable Senate seats, including in races in Missouri, Indiana, North Dakota and West Virginia.

A RealClearPolitics average of polling data shows Democrats with a roughly 6 percentage point lead on the generic ballot. That number has dropped from earlier in the year.

Obama has largely remained out of the political spotlight since leaving office 1 1/2 years ago. He has been critical of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's decision to withdraw from the Iran nuclear deal, and weighed in on the Trump administration's practice of separating migrant families at the border.