Washington (CNN) - Sen. Orrin Hatch "invited himself" to the Tea Party town hall that will be held in Washington on Tuesday, according to the chairman of the Tea Party Express.
On Monday, the Utah Republican confirmed, in a tweet, that he would join the event that's being billed as the first of its kind.
"He invited himself," Tea Party Express Chairman Amy Kremer told CNN. "I guess that he wanted to become a part of it. All I have to say is he needs to be ready to answer the tough questions."
"Obviously Sen. Hatch wants to get re-elected," Kremer added.
Some Tea Party activists have threatened to work for Hatch's ouster as he pursues a seventh term in the Senate. Critics cite votes that, they believe, show Hatch as less than rock-solid conservative and his working with Democrats on various issues.
Kremer re-stated what Tea Party Express chief strategist Sal Russo previously told CNN: that their group would not target Hatch, praising him as a solid conservative.
But Kremer stressed there's no guarantee that activists in Utah won't try to deny Hatch another term.
And, speaking more broadly, Kremer issued a message to all lawmakers.
"There is no senator or congressman in this country who needs to think their seat is safe," Kremer said.
CNN reached out to Sen. Hatch's office but was not able to get a response.
–Follow Shannon Travis on Twitter: @ShanTravisCNN