PIERS Morgan has threatened to break lockdown rules if Prime Minister Boris Johnson doesn't fire his chief aide Dominic Cummings today.

Johnson is under increasing pressure to sack Cummings after The Mirror revealed the PM's chief-of-staff was investigated by police for ignoring the Government’s own guidance.

He was spotted by witnesses at his parents’ home in Durham, more than 250 miles from his London property, while suffering from coronavirus symptoms.

Now Morgan, 55, has weighed in on the debate, warning he will follow Cummings' example by visiting his own parents in Sussex if Johnson doesn't take action.

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He tweeted: "If Boris doesn’t fire Cummings today, then I will deem the Lockdown over & drive down to see my parents (from a 2m distance) for the first time in 12 weeks.

"I’m not having one rule for these clowns & another for the rest of us."

>> READ MORE: Piers Morgan lends Sussex home to parents

The Good Morning Britain host hasn't seen his mother or father in months while they isolate in Newick.

Last night, Piers also wrote: "Are you f**king kidding me????? Cummings should resign immediately or be fired.

He added: "So, Boris Johnson’s right hand man Dominic Cummings broke lockdown to go to his parents’ house 100s of miles away... AS HE SELF-ISOLATED WITH CORONAVIRUS SYMPTOMS.

"Fire him tonight Prime Minister @BorisJohnson - or why should anybody heed your lockdown rules?"

A Downing Street spokesman has since insisted Cummings was not spoken to by police, and believed he behaved "reasonably and legally".

The Argus:

They said: "Owing to his wife being infected with suspected coronavirus and the high likelihood that he would himself become unwell, it was essential for Dominic Cummings to ensure his young child could be properly cared for.

"His sister and nieces had volunteered to help so he went to a house near to but separate from his extended family in case their help was needed.

"His sister shopped for the family and left everything outside.

"At no stage was he or his family spoken to by the police about this matter, as is being reported.

His actions were in line with coronavirus guidelines.

"Mr Cummings believes he behaved reasonably and legally."