Boston labor rights attorney Shannon Liss-Riordan is preparing to mount a primary challenge to Sen. Edward Markey Edward (Ed) John MarkeyDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death MORE (D-Mass.) in 2020, according to the Boston Globe.

Liss-Riordan filed paperwork with the Federal Election Commission last month and wrote Friday that she plans to make her final decision “in the coming weeks.”

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“I have been so energized and inspired by the conversations I’ve been having with people across Massachusetts as I have been exploring a run,” Liss-Riordan said, according to the Globe. Liss-Riordan has been involved in several high-profile cases against gig economy firms such as Uber.

Markey has about $3.5 million cash on hand for his 2020 campaign and raised about $940,000 this year, according to the Globe. He faced no primary opposition in 2014, his first campaign for a full term after winning a special election to complete then-Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE’s term in 2013.

Backers of a primary challenge to Markey have pointed to another recent major primary upset in Massachusetts, Rep. Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE’s (D) successful challenge to then-Rep. Michael Capuano Michael (Mike) Everett CapuanoHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections 'Markeyverse' of online fans helps take down a Kennedy Inside the progressive hunt for vulnerable House Democrats MORE, a 10-term incumbent. Since the 2018 midterms Markey has taken steps to shore up his progressive credentials, sponsoring the Senate version of Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezWells Fargo CEO issues apology after saying there was a 'limited pool of Black talent' Brand responds to Trump claim protesters throw tuna cans at police: 'Eat em, don't throw em' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context MORE’s (D-N.Y.) Green New Deal resolution.

“Senator Markey is fighting every day in the Senate for the people of Massachusetts. From universal health care, to a Green New Deal, to equal rights, to gun safety, Senator Markey stands up for Massachusetts families and fights against the destructive, corrupt Trump administration,” a spokesperson for Markey’s office told the Globe. “He is excited and energized to run for another term.”