The president of Carrier’s union started receiving threats after Donald Trump launched a Twitter attack going after the union leader for noting that Trump inflated the number of Carrier jobs he saved in Indiana.

Trump last week touted his deal with Carrier’s parent company, United Technologies, to save jobs at an Indiana Carrier factory, claiming that he convinced the air conditioner manufacturer to keep 1,100 jobs in the U.S. However, United Technologies had never planned to move 350 of those jobs to Mexico and still plans to cut 700 jobs from another factory.

Chuck Jones, the president of United Steelworkers 1999, told the Washington Post in an interview published Tuesday that Trump “lied his ass off” about the number of jobs he saved. And in a Wednesday evening appearance on CNN, Jones emphasized that more than 500 people in Indianapolis will still lose their jobs, in addition to 700 people in another Indiana factory who will also lose their positions to Mexico.

Jones’ appearance on CNN prompted a Twitter attack from Trump.

Chuck Jones, who is President of United Steelworkers 1999, has done a terrible job representing workers. No wonder companies flee country! — Donald J. Trump (@realDonaldTrump) December 8, 2016

If United Steelworkers 1999 was any good, they would have kept those jobs in Indiana. Spend more time working-less time talking. Reduce dues — Donald J. Trump (@realDonaldTrump) December 8, 2016

Jones later told MSNBC that after Trump’s criticism, he began receiving threats.

“Nothing that says they’re gonna kill me, but, you know, you better keep your eye on your kids,” Jones said of the threats he’s received. “We know what car you drive. Things along those lines.”