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