A Montana Republican who mounted a Senate campaign only to be greeted by former President Donald Trump s near-instant endorsement of his opponent has ended his campaign after just six days.

Rep. Matt Rosendale officially launched a Senate bid last Friday after long teasing his desire for a rematch against Democratic Sen. Jon Tester, whom he lost to in 2018. The news was first reported by Politico.

I have long been a supporter of the President, and remain so. But I have been forced to calculate what my chances of success would be with Trump supporting my opponent. This race was already going to be tough, as I was fighting against Mitch McConnell and the rest of the Republican establishment in Washington. But I felt like I could beat them, as the voters do not agree with them choosing who would be the next U.S. Senator from Montana, Rosendale said in a statement.

However, by my calculations, with Trump endorsing my opponent and the lack of resources, the hill was just too steep.

Rosendale got an icy reception from national Republicans , who are backing former Navy SEAL and wealthy businessman Tim Sheehy for the GOP nomination.