Sen. Ed Markey Edward (Ed) John MarkeyA game theorist's advice to President Trump on filling the Supreme Court seat Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE's (D-Mass.) campaign released a fundraising email on Friday ahead of Rep. Joe Kennedy Joseph (Joe) Patrick KennedyDemocrats see fundraising spike following Ginsburg death Massachusetts town clerk resigns after delays to primary vote count Bogeymen of the far left deserve a place in any Biden administration MORE III's (D-Mass.) announcement that he will launch a primary challenge against the senator on Saturday.

"It’s official: Joe Kennedy III will challenge Ed Markey in the primary," the fundraising email noted.

"Ed has never backed down from fights that define our times," it added, before asking for a $27 donation.

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The campaign said in the email that they set a fundraising goal of $50,000 ahead of the next Federal Election Committee deadline at the end of the month.

The incumbent senator's team highlighted his record on climate change, including his work on the Green New Deal, gun legislation and health care.

He also touted his ties to progressive firebrand Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.) and fellow Massachusetts Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D) in the email.

A source confirmed to The Hill earlier this week that Kennedy, who is the grandson of Robert F. Kennedy, will announce his run on Saturday.

While Kennedy has been seen as a rising Democratic star, a number of young progressive insurgents have declined to throw their support behind him.

Ocasio-Cortez touted her support for Markey on Twitter last week, calling him a "progressive champion," while Warren has endorsed Markey, despite having a close relationship with Kennedy.

Meanwhile, Reps. Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (Mich.), Seth Moulton Seth MoultonOvernight Defense: Nearly 500 former national security officials formally back Biden | 40 groups call on House panel to investigate Pentagon's use of coronavirus funds The Hill's Morning Report - Presented by Facebook - Markey defeats Kennedy; Trump lauds America's enforcers in Wisconsin Moulton fends off primary challenges in Massachusetts MORE (Mass.) and Eric Swalwell Eric Michael SwalwellHouse to vote on resolution affirming peaceful transition of power Swalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions MORE (Calif.) have said they are staying out of the race, while Rep. Ro Khanna Rohit (Ro) KhannaOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package The movement to reform animal agriculture has reached a tipping point MORE (D-Calif.) has thrown his support behind Markey.