During her Democratic National Convention speech on Thursday, presidential nominee Hillary Clinton criticized her GOP rival, Donald Trump, accusing him of being too thin-skinned to be trusted as commander-in-chief.

Trump is known for his prolific use of Twitter and also for his bombastic responses to critics — including calling Massachusetts Sen. Elizabeth Warren “Pocahontas” for targeting him on the social media platform. On Thursday night, Clinton said this tendency is dangerous for a president.

“A man you can bait with a tweet is not a man we can trust with nuclear weapons,” Clinton said.

The comments seemed to get under Trump’s skin on Friday morning.

Crooked Hillary Clinton made up facts about me, and “forgot” to mention the many problems of our country, in her very average scream!

— Donald J. Trump (@realDonaldTrump) July 29, 2016

He added, “The media coverage this morning of the very average Clinton speech and Convention is a joke. @CNN and the little watched @Morning_Joe = SAD!” He then criticized Clinton for saying she believed in science and that climate change was a threat.

“@AnnCoulter: “I believe in science” Dem code for “we’re shutting down coal mines, steel plants and any other remaining manufacturing”” — Donald J. Trump (@realDonaldTrump) July 29, 2016

Trump also blasted former New York City mayor Michael Bloomberg, who endorsed Clinton and criticized Trump in a DNC speech.

“‘Little’ Michael Bloomberg, who never had the guts to run for president, knows nothing about me. His last term as Mayor was a disaster!” Trump wrote.

In what seems like an unprecedented move for a presidential contender, Trump went after retired four-star General John Allen, a Marine Corps veteran who spoke on behalf of Clinton, taking the stage with fellow military veterans.

General John Allen, who I never met but spoke against me last night, failed badly in his fight against ISIS. His record = BAD #NeverHillary — Donald J. Trump (@realDonaldTrump) July 29, 2016