Open this photo in gallery: Republican presidential candidate and former President Donald Trump speaks to the crowd during a caucus event, Dec. 2, 2023, at Kirkwood Community College in Cedar Rapids, Iowa.Geoff Stellfox/The Associated Press Donald Trump, the front-runner for the Republican presidential nomination, told his supporters on Saturday to “go into” Philadelphia and two other Democratic-run cities to “guard the vote” in 2024, repeating his unfounded claims of widespread election fraud in 2020 as justification for the call to action. Speaking at a campaign event in Iowa, Trump said it was important to scrutinize the vote in the battleground...