Several Conservative MPs have called for the PM’s chief adviser Dominic Cummings to quit, amid claims he broke coronavirus lockdown rules.
The aide is facing allegations of a second trip to the North East, reported by The Observer and Sunday Mirror.
Downing Street says this is “false” and cabinet minister Grant Shapps says Mr Cummings – who has been seen going into No 10 – will not quit.
Steve Baker is among the backbench MPs to question his position.
Mr Cummings refused to answer questions on the fresh allegations from reporters and TV crews outside his London home on Sunday.
On Saturday, he and the government had said he acted “reasonably and legally” in response to the original claims that he drove 260 miles from London to County Durham while his wife had coronavirus symptoms.
Labour has called for an urgent inquiry into the allegations, while government ministers rallied around Mr Cummings on Saturday and defended his conduct.
Matt Hancock and Michael Gove were among those to back Mr Cummings for self-isolating at a property adjacent to other family members in case he and his wife needed help with childcare.