President Trump on Monday blamed Ohio Gov. John Kasich for the lackluster performance of their party’s nominee in a heavily Republican district last week, in an apparent effort to counter critics of his own impact on the race.

Trump made the comments in a tweet that came one day after Kasich, a potential 2020 presidential contender who is among Trump’s most prominent GOP critics, said in an appearance on NBC News’s “Meet the Press” that the nail-biter 12th Congressional District race was a warning from voters to the Republican Party.

“The very unpopular Governor of Ohio (and failed presidential candidate) @JohnKasich hurt Troy Balderson’s recent win by tamping down enthusiasm for an otherwise great candidate,” Trump said. “Even Kasich’s Lt. Governor lost Gov. race because of his unpopularity. Credit to Troy on the BIG WIN!”