GOP White House hopefuls face mounting pressure to stop Trump in Iowa

Republican presidential candidate former Vice President Mike Pence talks with moderator Tucker Carlson, left, during the Family Leadership Summit, Friday, July 14, 2023, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

DES MOINES, Iowa (AP) — As the six-month sprint to the Iowa caucuses begins, the sprawling field of Republican presidential candidates is facing growing pressure to prove they can become serious challengers to former President Donald Trump.