Former Vice President Mike Pence has declined to endorse his onetime running mate, former President Trump, in a bombshell announcement Friday.

Pence, whose relationship soured with Trump after the January 6 riots where the president faulted him for refusing to send disputed electoral slates back to state legislatures in his then-role as president of the Senate, said his announcement however should not come as a shock.

"It should come as no surprise that I will not be endorsing Donald Trump this year," Pence said.

"I'm incredibly proud of the record of our administration. It was a conservative record that made America more prosperous, more secure and saw conservatives appointed to our courts in a more peaceful world."

This is a developing story. Stay tuned for updates.