U.S. Sen. Roy Blunt has been disinvited from a local GOP gathering in Christian County, Missouri, next month amid a backlash over his vote to block President Donald Trump’s use of emergency powers to build a border wall.

The senior GOP senator from Missouri was one of 12 Republicans who joined Democrats in voting against Trump’s national emergency declaration, a move that has sparked anger within the president’s base. As a Republican sharing the ballot with Trump in 2016, Blunt squeaked out a narrow 3-point win on Trump’s coattails.

His vote on Thursday angered ardent Trump supporters across Missouri, who saw it as a betrayal.

“I am so disappointed in you now that I can hardly speak,” wrote Wanda Martens, a member of the Christian County Republican Central Committee, in an email to Blunt’s office.