Following reports of murdered police officers in Dallas Thursday night, former Congressman and Tea Party activist Joe Walsh tweeted out that there was now a state of war in America and cautioned President Obama to “watch out.”

He subsequently deleted that tweet, but other users preserved it in screengrabs.

Joe Walsh deleted his tweet. Here's the screenshot: pic.twitter.com/t5ke5YWxbu — Kyle Griffin (@kylegriffin1) July 8, 2016

In tweets he chose not to delete, he accused Obama of having “stoked the flame” and said that Black Lives Matter should be designated as a “hate group.”

4 dead. Obama stoked the flame. BLM did this. Cops are dying. — Joe Walsh (@WalshFreedom) July 8, 2016

BLM should be categorized as a hate group. — Joe Walsh (@WalshFreedom) July 8, 2016

He accused BLM activists of applauding the officers’ deaths and sought to link the murders to various flashpoints in the culture wars.

4 Dallas Cops assassinated tonight. Blacks lives matter cheers. LGBT blames Christians. Obama defends Islam. — Joe Walsh (@WalshFreedom) July 8, 2016

It's time 4 patriotic Americans to stand up & stand against all the Cop haters – from Obama to the thugs on the street. It's way past time. — Joe Walsh (@WalshFreedom) July 8, 2016

Some Twitter users suggested that Walsh should be investigated by the Secret Service for his threats. Others were more direct:

Sit the fuck down, shut the fuck up… Drink some damn battery acid you irrelevant piece of human garbage #Dallas https://t.co/L6BXvhBvna — Montel Williams (@Montel_Williams) July 8, 2016

UPDATE 9:22 A.M. ET: Twelve officers were confirmed to have been shot in the ambush, five of whom have died.

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