Donald Trump will no longer be stopping by “Jimmel Kimmel Live” tonight, as the presidential hopeful cancelled his appearance just hours before he was set for the late-night show.

Kimmel announced the news Tuesday morning on Howard Stern’s radio show.

“Donald Trump canceled on us last night,” Kimmel told Stern, stating the reasoning is “unclear,” but that Trump indicated a political event was the source of conflict. “I don’t know what happened,” Kimmel added, sarcastically continuing, “We’re delighted, needless to say.”

Though Trump was scheduled to appear, he was never set for a full sit-down guest interview. Rather, he was just supposed to take part in an on-stage bit, likely planned for after the first guest’s interview. Kimmel told Variety about Trump’s original plans in an interview earlier this week.

This week, Kimmel moved his show to Brooklyn, New York from its usual L.A. home. Though Trump is expected to reschedule his appearance, scheduling may be tough given “Jimmy Kimmel’s” regular California location and the real estate mogul’s busy campaign trail.

Other guests set for Kimmel’s week in Brooklyn include Jay Z and Tracy Morgan, who will be on the show tonight, Michael J. Fox, Joy Behar, Bradley Cooper, and Stern, who’ll wrap up the week with an interview on Friday.

In addition to multiple media appearances across many news outlets, Trump has made the late-night rounds with appearances on Stephen Colbert’s CBS “Late Show” and Jimmy Fallon’s “Tonight Show” on NBC this season. He has not yet been on “The Daily Show” with new host Trevor Noah, though in a September interview with Variety, Noah said he hopes to have Trump on the Comedy Central show.

Similar to the Kimmel-Trump situation, House Speaker John Boehner recently withdrew from a scheduled appearance on Fallon’s show, due to a political obligation.

Trump is also set to host “Saturday Night Live” on November 7.

Update: Trump campaign spokeswoman Hope Hicks said, via email, “Unfortunately Mr. Trump now has a political obligation that will prevent him from joining as planned, but we have rescheduled to join in-studio in LA over the next few weeks.”

On Kimmel’s show Tuesday night, the host spoke of Trump’s cancellation, poking fun at him and the situation.

“You know Donald Trump was supposed to be here tonight,” he noted, drawing thunderous boos from the crowd. “And now he’s glad he didn’t come, I guess…”

“Last night, his people called and cancelled on us,” Kimmel said on the broadcast. “They were a little bit cryptic as to why he cancelled. They said he has a major political commitment — but he did want me to relay the message to you that if he was here, he would have been great.”

Shedding light on Trump’s many recent media appearances, Kimmel continued, “I’m dying to find out what this major political commitment was. Usually, it means he had to go on CNN to call someone an idiot, or something. Why did he cancel? We told him there were cameras here, right? Are Tuesday nights the night he volunteers down at the orphanage?”

On a roll, Kimmel added, “But don’t worry, we’re giving everyone in our audience a basketball dipped in cologne — so you can fully experience what it would have been like if he was here.”

Adding a reference of Trump’s controversial comments about Mexican immigrants, Kimmel said: “The good news of Donald not being here tonight is, now we don’t have to build a wall around Guillermo.”