DeSantis challenges Trump in early states as feud escalates amid name-calling

DeSantis held events in Iowa and New Hampshire as Trump returned to campaigning in Iowa
Polls show Trump and DeSantis nearly tied nationally but Trump leads big in early states
Trump launched repeated attacks on DeSantis, mocking his name pronunciation and policies
DeSantis vowed to fight back, calling Trump's behavior "petty" and "juvenile"
The battle for the 2024 GOP nomination is intensifying between Trump and DeSantis