Former Massachusetts Gov. Bill Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE, a Republican taking on President Trump in 2020, challenged his fellow GOP members to watch the president's rally in North Carolina and ask if that is the party they "signed up for."

During Trump's Wednesday night rally, the president's comments over Rep. Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), one of the four minority congresswomen he recently told to "go back" where they came from, prompted the crowd into chants of "send her back."

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"I challenge every Republican to watch

’s rally last night, complete with chants of 'Send her back,' and ask if that is the Party of Lincoln and Reagan we signed up for," Weld tweeted Thursday morning. "We are in a fight for the soul of the GOP, and silence is not an option."

I challenge every Republican to watch @realDonaldTrump’s rally last night, complete with chants of “Send her back”, and ask if that is the Party of Lincoln and Reagan we signed up for. We are in a fight for the soul of the GOP, and silence is not an option. #AmericaDeservesBetter — Gov. Bill Weld (@GovBillWeld) July 18, 2019

The long-shot candidate is the only Republican to officially mount a primary campaign against the president in 2020.

Earlier this week, former South Carolina Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R) said he is considering a possible candidacy.

And Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (I-Mich.), who recently left the Republican Party after vocally opposing Trump, said he wouldn't rule out a run.

Trump's rally followed a week of backlash against the president's Sunday tweet targeting Reps. Omar, Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.) and Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.), telling them to "go back" to where they came from.

All four are women of color and U.S. citizens, and only Omar, who came to the U.S. at age 12 as a refugee from Somalia, was born outside the United States.

The House voted to condemn Trump for his "racist" tweets on Tuesday. Just four Republicans, Reps. Susan Brooks (Ind.), Brian Fitzpatrick (Pa.), Will Hurd (Texas) and Fred Upton (Mich.), voted with every Democrat to condemn the tweets.