WASHINGTON — U.S. Sen. Roy Blunt has been disinvited from a local GOP gathering in Christian County, Mo., 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 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. “Why could you not support my president in the emergency declaration? President Trump tried every available means to work the Senate to resolve the border issue and build the much needed wall. He is well within his presidential powers to do this.”

Martens serves as the local party committee’s events chair. She told the senator in her email, which was obtained by The Kansas City Star, that she did not want to see him when the local party holds its Lincoln/Trump Day Dinner on April 6 in Ozark, Mo., one of the most conservative areas in the state.

Chuck Branch, another member of the central committee, said he was frustrated by Martens’ decision to revoke Blunt’s invitation. Branch, the retired general manager of Christian County Headliner News, originally had been the one to ask Blunt to attend the dinner.

“I think that we absolutely need to stand by the people who we send to Washington. We don’t have to agree on policy,” Branch said. “Taking it to a personal level of not inviting him to a Republican event seems to be crossing a line in my view.”

Blunt, the only member of Senate Republican leadership to support the resolution, pointed to his opposition to executive overreach during the Obama administration. He also warned that the precedent would enable a future president to use the National Emergencies Act to enact gun control or strict environmental regulations opposed by Republicans.

“The same principle should apply regardless of which party occupies the White House,” Blunt wrote.

Blunt is on a congressional delegation trip and could not be reached for comment Monday. He is the fourth-ranking Republican in the Senate and is a senior member of the appropriations committee, which doles out federal funds.