Senator Bob Corker made headlines last October when he became the first GOP senator to announce he would not seek reelection in 2018—then quickly ignited a public spat with President Donald Trump, with the two trading barbs on Twitter. Over a period of weeks, Corker called the Trump White House “an adult day care center,” said Trump had “proven himself unable to rise to the occasion” of being president, and said there was “no way” he could support him again. Meanwhile, Trump (incorrectly) savaged Corker as an enabler of President Obama’s Iran deal, and jeered that he “couldn’t get elected dog catcher.”

Which makes the news that Corker is apparently considering hopping back into the race pretty awkward for everyone involved.