On Thursday, President Donald Trump tore into Ohio Gov. John Kasich.
Kasich is a GOP rival and potential 2020 primary challenger.
Thursday, the President was appearing before a Republican National Committee dinner.
The President mocked Kasich, who is being termed-out of office.
Trump described Kasich as one of his loudest and most relentless critics.
The Trump-Kasich feud has been simmering ever since the 2016 campaign.