By Rick Michaels - Massachusetts Congressman Joe Kennedy is getting ready to announce he’ll challenge U.S. Sen. Edward Markey for his seat, in the State's Democratic Primary in 2020. According to various sources Kennedy will formally make the announcement on Saturday. Kennedy has been building up his staff and formally announcing his interest in the race by filing preliminary paperwork with the Federal Election Commission last month. Kennedy told reporters at the State Democratic convention last weekend you have to go out and make your case to voters every two years in the House while shying away from directly criticizing Senator Markey, calling him "a good man." Markey, who's already facing two lesser known challengers, has said he's ready to take on anyone, even Kennedy. A Kennedy-Markey contest will put more than a few high profile Democrats in an awkward position, most notably White House hopeful Elizabeth Warren, who has worked with Markey in the Senate, and she has formally endorsed Markey before Kennedy floated the idea of a challenge. Kennedy and Markey have worked together at times, reintroducing a bill that would end the use of "gay panic" and "trans panic" defenses in federal court, a defense that argues that the revelation of an individual's sexual orientation or gender identity helped provoke a defendant's violent reaction. Markey is already facing two lesser known candidates: Shannon Liss-Riordan, a workers rights lawyer, and Steve Pemberton, a former senior executive at Walgreens.