Story highlights Donald Trump is firmly training his sights on Ohio Gov. John Kasich ahead of Tuesday's winner-take-all Ohio primary

The Republican front-runner spent more time here on Sunday attacking the Ohio governor than any other of his presidential rivals

West Chester, Ohio (CNN) Donald Trump is training his sights on Ohio Gov. John Kasich ahead of Tuesday's winner-take-all Ohio primary.

The Republican front-runner spent more time here on Sunday attacking the Ohio governor than any other of his presidential rivals. And after spending more time in Ohio this weekend than any other state, Trump on Sunday announced he was scrapping a scheduled event in Florida to instead rally supporters once more in the Buckeye State.

Trump will now stump Monday night in Youngstown, Ohio -- a city emblematic of the decline of the steel industry in Ohio and the broader Rust Belt. The change comes after a series of polls published in the last week have shown Trump with a double-digit lead in Florida, while staring down Kasich's narrow home state advantage here.

JUST WATCHED Kasich: Trump has created a 'toxic atmosphere' Replay More Videos ... MUST WATCH Kasich: Trump has created a 'toxic atmosphere' 02:48

CNN's average of the most recent polls puts Trump 24 points ahead of Rubio in the Floridian's home state. In Ohio, Trump is trailing Kasich by 5 and 6 percentage points in polls released this week by Fox News and NBC News/Wall Street Journal/Marist, respectively.

"I think you've gotta show him folks ... you can't be an absentee governor," Trump said Sunday of Kasich, urging his supporters to get to the polls on Tuesday. "He should go along and be governor."

Read More