Actor Rob Lowe mocked Sen. Elizabeth WarrenElizabeth Ann WarrenSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Gillibrand uses Trump Jr. tweet to fundraise MORE (D-Mass.) and her past claims of Native American ancestry on Saturday following her presidential campaign announcement.

In a tweet Saturday afternoon, the 'West Wing' actor joked that the senator's candidacy would give new meaning to the title "Commander in Chief."

"Elizabeth Warren would bring a whole new meaning to Commander in 'Chief,'" Lowe wrote.

He later deleted the post, saying it was a "joke."

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His initial tweet came hours after President TrumpDonald John TrumpTrump nominates Jeffrey Rosen to replace Rosenstein at DOJ McCabe says ‘it’s possible’ Trump is a Russian asset McCabe: Trump ‘undermining the role of law enforcement’ MORE made a similar remark on Twitter that appeared to reference the 1833-1850 Trail of Tears, a forced relocation of thousands of Native Americans.

"Today Elizabeth Warren, sometimes referred to by me as Pocahontas, joined the race for President. Will she run as our first Native American presidential candidate, or has she decided that after 32 years, this is not playing so well anymore? See you on the campaign TRAIL, Liz!" Trump tweeted earlier in the day.

Warren, who announced earlier late last year that she was exploring a 2020 bid for president, announced the official start of her campaign on Saturday in Lawrence, Massachusetts on Saturday. The senator joins a crowded field of Democratic contenders including Sens. Kirsten GillibrandKirsten Elizabeth GillibrandSanders campaign reports raising M in less than a day Gillibrand uses Trump Jr. tweet to fundraise Meghan McCain: 'Don't underestimate' Bernie Sanders MORE (D-N.Y.), Kamala HarrisKamala Devi HarrisSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Gillibrand uses Trump Jr. tweet to fundraise MORE (D-Calif.), and Rep. Tulsi GabbardTulsi GabbardDNC punts on measure to reduce role of corporate PAC money NBC, CNN to host first two Democratic presidential primary debates Exclusive: Biden almost certain to enter 2020 race MORE (D-Hawaii).

She has faced criticism in the past and has apologized for claiming Native American ancestry, noting earlier this month that she understands the difference between DNA indicating a possible Native American ancestor and tribal heritage.

--This report was updated on Feb. 10 at 8:43 a.m.