Actor Rob Lowe mocked Sen. Elizabeth WarrenElizabeth Ann WarrenSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch 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 TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future 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 GillibrandThe Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch Gabbard, Steyer inch toward making third Democratic debate Gillibrand unveils mental health plan MORE (D-N.Y.), Kamala HarrisKamala Devi HarrisSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch MORE (D-Calif.), and Rep. Tulsi GabbardTulsi GabbardSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates The Hill's Morning Report: How will Trump be received at G-7? 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.