The Republican Party plans to ask 2024 presidential candidates to pledge support for the eventual nominee, Republican National Committee Chairwoman Ronna McDaniel said on Sunday, espousing an idea so far not embraced by former President Donald Trump. Candidates who do not sign the pledge will not be allowed to participate in party-sponsored debates during the state-by-state presidential nominating contests, McDaniel said. Trump, who remains popular in the Republican Party but is already facing challenges in his next White House bid from former supporters including Nikki Haley, has so far refused to commit to supporting the eventual Republican nominee.