Mitt Romney will hit the campaign trail Monday with John Kasich, CBS News' Chief White House correspondent Major Garrett confirms.

On the eve of the Ohio primary, the 2012 nominee will appear with the Ohio governor in events in Westerville and North Canton. Romney recently delivered a speech dissecting Donald Trump's candidacy -- he called him a "phony" and a "fraud" and criticized Trump for the controversial things he's said on the campaign trail, as well as for his business acumen.

Romney has said he isn't endorsing but believes any of the three other contenders, Kasich, Florida Sen. Marco Rubio and Texas Sen. Ted Cruz would all be more suitable Republican nominees than Trump. He has offered to help any of their campaigns and has already recorded robocalls for both Rubio and Kasich.

In addition to the other two appearances, Kasich will also be campaigning in Youngstown Monday, and Trump has also added another appearance in Ohio, too, as polls show a tight race between the two.

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CBS News' Battleground Tracker poll shows a tie between Kasich and Trump going into Tuesday's primary.