Joe Kennedy to endorse Warren during campaign announcement

Rep. Joe KennedyJoseph (Joe) Patrick KennedyYoung insurgents aren't rushing to Kennedy's side in Markey fight Ocasio-Cortez endorses Markey in Senate race amid speculation over Kennedy candidacy The Hill's Morning Report - 2020 Democrats set for Lone Star showdown MORE III (D-Mass.) is set to endorse Sen. Elizabeth WarrenElizabeth Ann WarrenKavanaugh impeachment push hits Capitol buzz saw Mark Mellman: The most important moment in history? Katie Pavlich: The Democrats' desperate do-overs MORE (D-Mass.) for president when she formally announces her candidacy on Saturday, according to a person familiar with the plans.

Kennedy will make the announcement in a speech introducing Warren at an event in Lawrence, Mass., where she is expected to officially kick off her campaign for the White House. The planned endorsement was first reported on Friday by The Boston Globe.

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A spokesperson for Warren's campaign did not immediately respond to The Hill's request for comment.

Kennedy, a rising star in the Democratic Party, will be among Warren's first high-profile endorsers. 

While most lawmakers have so far withheld their endorsements in the nascent 2020 Democratic presidential primary, a handful of politicians have offered candidates their support. 

Sen. Bob MenendezRobert (Bob) MenendezAs NFIP reauthorization deadline looms, Congress must end lethal subsidies Senate Democrats warn Trump: Don't invite Putin to G-7 Pelosi warns Mnuchin to stop 'illegal' .3B cut to foreign aid MORE (D-N.J.) endorsed Sen. Cory BookerCory Anthony BookerMark Mellman: The most important moment in history? Katie Pavlich: The Democrats' desperate do-overs Biden leads in new national poll, Warren close behind in second place MORE (D-N.J.) last week after he threw his name into the primary contest.

And Sen. Kamala HarrisKamala Devi HarrisKavanaugh impeachment push hits Capitol buzz saw Mark Mellman: The most important moment in history? Biden leads in new national poll, Warren close behind in second place MORE (D-Calif.), who announced her candidacy last month, has already secured endorsements from California lawmakers, including Reps. Ted LieuTed W. LieuTed Lieu congratulates first Asian American cast member on 'Saturday Night Live' Ocasio-Cortez renews impeachment call amid probe involving Trump's Scotland property Oversight panel investigating Air Force crew's stop at Trump property in Scotland MORE (D) and Katie HillKatherine (Katie) Lauren HillYoung insurgents aren't rushing to Kennedy's side in Markey fight Polling director: Young voters swayed by health care, economy, gun control Lawmakers grill manufacturers over 'forever chemicals' contamination MORE (D). 

Kennedy's endorsement could give Warren a boost as she seeks to move beyond the controversy surrounding her past claims of Native American ancestry. 

Criticism of those claims was renewed this week after The Washington Post published a copy of Warren's 1986 registration card for the State Bar of Texas in which she identifies herself as "American Indian."

Updated at 1:38 p.m.