Ted Cruz’s refusal to formally endorse Donald Trump onstage in Cleveland on Wednesday drew agitated chants of “EN-DORSE TRUMP” from the crowd, followed by audible boos from angry delegates when he didn’t heed their calls. From the sounds of it, though, the reception the Texas senator received when he stepped off the stage was even harsher.

CNN reports that a man in a donor suite had to be restrained from assaulting Ted Cruz after he entered it after his speech. — Conor Friedersdorf (@conor64) July 21, 2016

CNN’s Manu Raju and BuzzFeed’s Rosie Gray with more from the scene:

HEIDI CRUZ escorted out by security as crowd gets angry at Cruz for his speech. One Trump supporter shouting "Goldman Sachs!" at her — Manu Raju (@mkraju) July 21, 2016

Ken Cuccinelli told me he cleared the way for Heidi Cruz to leave because of "all the people physically approaching her, berating her." — Manu Raju (@mkraju) July 21, 2016

Just spoke to a source who says witnessed the head of the WA delegation go "bananas" on Cruz and call him a traitor — Rosie Gray (@RosieGray) July 21, 2016

this was on bottom level suites in Q. source says aggressor was a woman who ID'ed herself as head of WA state delegation — Rosie Gray (@RosieGray) July 21, 2016

Source: "security kind of stepped in" but it "wasn't like anyone got arrested it was just really dramatic" — Rosie Gray (@RosieGray) July 21, 2016

Meanwhile, on the floor:

WATCH: Gov. Christie on Ted Cruz: "Awful, selfish speech ... showed himself tonight to not be a man of his word." https://t.co/jjvRlWX3Wf — NBC Nightly News with Lester Holt (@NBCNightlyNews) July 21, 2016

There’s no doubt Cruz knew that his endorsement-free convention speech wasn’t going to be warmly received by Republican politicians and donors who have cast their lot with Trump, but he probably wasn’t expecting this. Meanwhile, the Trump campaign reportedly signed off on Cruz’s prepared remarks, so it would have known no endorsement was forthcoming—which makes this report all the more interesting:

Two sources tell me Trump team actively whipped the “boos” at the end of Cruz speech — Zeke Miller (@ZekeJMiller) July 21, 2016

Read more Slate coverage of the 2016 campaign.