Joe Kennedy says he's considering Senate run

Rep. Joe KennedyJoseph (Joe) Patrick KennedyLawmakers from both sides of the aisle mourn Cummings Ocasio-Cortez taps supporters for donations as former primary opponent pitches for Kennedy The 13 House Democrats who back Kavanaugh's impeachment MORE III (D-Mass.) said in a Facebook post on Monday that he's considering a run for Senate in Massachusetts, a decision that could set up a Democratic primary against Sen. Ed MarkeyEdward (Ed) John MarkeyOvernight Defense — Presented by Boeing — House passes resolution rebuking Trump over Syria | Sparks fly at White House meeting on Syria | Dems say Trump called Pelosi a 'third-rate politician' | Trump, Graham trade jabs Senate confirms Trump's Air Force secretary pick Democratic senators condemn Trump for calling on China to investigate Bidens MORE (Mass.).

"Over the past few weeks I've begun to consider a run for the U.S. Senate. This isn't a decision I'm approaching lightly and -- to be completely candid -- I wasn't expecting to share my thoughts so soon," Kennedy said in a post to supporters. 

Kennedy filed paperwork with the Federal Election Commission on Monday, allowing him to raise for a Senate bid. 

Markey is up for reelection in 2020, and speculation that Kennedy could challenge his fellow Democrat has been mounting. 
 
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A senior adviser to Markey's campaign told The New York Times that Markey was not considering stepping aside. 
 
“Ed is not going anywhere,” Paul Tencher said. “He’s going to run, and he’s going to run no matter who is in this race.”
 
A group titled Jump in, Joe! is already pushing voters online to encourage Kennedy to launch a challenge. 
 
“The congressman should run because our country is vulnerable, and he has demonstrated that he has the energy, courage, and progressive ideas to fight for the Commonwealth and put our nation on a more just course," the group said on its website. 
 
Kennedy, currently in his fourth term in Congress, comes from a well-established political dynasty that has featured former President John F. Kennedy, former Sen. Ted Kennedy (D-Mass.), as well as former Attorney General Robert F. Kennedy.  
 
Kennedy said that he is motivated to run because "our system has been letting down a lot of people for a long time, and we can't fix it if we don't challenge it." 

"I've got some ideas on how to do that. And I don’t think our democratic process promises anyone a turn. What it does promise is the chance for anyone to earn it — if we think we have something to offer and are willing to put ourselves and our ideas out there," he said in response to individuals who have advised him to wait. 

Kennedy said that he has not yet reached a decision, and was considering a number of factors including the impact a campaign would have on his family. The congressman has two children under the age of four. 

The young congressman is considered a rising star within the Democratic Party, and delivered the Democratic response to President TrumpDonald John TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS MORE's State of the Union address in 2018. 

— Updated at 11:46 a.m.