Trump's campaign refused to sign a pledge in Illinois not to overthrow the government when registering for the primary ballot. The pledge requires candidates to promise not to advocate overthrowing the US or state governments by force. Trump signed in 2016 and 2020, and his campaign gave no reason for not signing now. A Biden campaign spokesman said Trump can't sign because he tried to overthrow the government on Jan 6. At Iowa rallies, Trump bizarrely claimed the Civil War could have been negotiated and praised China.