Breitbart News's Stephen Bannon has warned President Donald Trump of intense opposition should he back new gun-control measures in response to Sunday's mass shooting in Las Vegas.

Here's what Axios reporter Jonathan Swan reported on Tuesday:

Breitbart chief Stephen Bannon. Credit:AP

"I asked Steve Bannon whether he could imagine Trump pivoting to the left on guns after the Las Vegas massacre. 'Impossible: will be the end of everything,' Bannon texted. When asked whether Trump's base would react worse to this than they would if he supported an immigration amnesty bill, Bannon replied: 'as hard as it is to believe actually worse.'"

The message from Trump's former chief strategist is clear: Mr. President, don't even think about it.