“The letter even makes the delusional assertion that you are President ‘Trump’s #1 Supporter,’” wrote Michael S. Glassner, the chief operating officer of the Trump campaign. “We only assume your campaign is doing this to confuse President Trump’s loyal supporters in Alabama into believing the President supports your candidacy in the upcoming primary runoff election. Nothing could be further from the truth.”

The letter also quotes tweets from Trump last month in which he endorsed Tommy Tuberville, a former Auburn University football coach, in the GOP runoff, scheduled for July 14. In November, the winner will face Sen. Doug Jones (D-Ala.), who won a special election in 2017 to replace Sessions, who had joined Trump’s Cabinet.

“We want to be absolutely clear about it: President Trump and the Trump Campaign unambiguously endorse Tommy Tuberville,” Glassner wrote in the letter dated Tuesday. “We demand that you and your campaign immediately stop circulating mailers — or any other similar communication — that wrongly suggest otherwise.”