Actor Rob Lowe mocked Sen. Elizabeth WarrenElizabeth WarrenBiden VP race is highly fluid days before expected pick Senate Democrats demand answers on migrant child trafficking during pandemic Senate Democrats push to include free phone calls for incarcerated people in next relief package 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 TrumpBiden says his faith is 'bedrock foundation of my life' after Trump claim Coronavirus talks on life support as parties dig in, pass blame Ohio governor tests negative in second coronavirus test 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 GillibrandSanders offers bill to tax billionaires' wealth gains during pandemic Senate Democrats demand answers on migrant child trafficking during pandemic Progressives soaring after big primary night MORE (D-N.Y.), Kamala HarrisKamala Devi HarrisBiden VP race is highly fluid days before expected pick Harris, Ocasio-Cortez push climate equity bill with Green New Deal roots Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-Calif.), and Rep. Tulsi GabbardTulsi GabbardFinancial firms facing serious hacking threat in COVID-19 era Gabbard drops defamation lawsuit against Clinton It's as if a Trump operative infiltrated the Democratic primary process 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.