Dominic Cummings says he “obviously” will not be quitting as the prime minister’s chief adviser over claims he broke coronavirus lockdown rules.
He said he did the “right thing” by travelling 260 miles with his family to be near relatives when his wife developed Covid-19 symptoms.
Downing Street said he wanted to ensure he had childcare if he got symptoms.
Labour and the SNP say he flouted the government’s own advice and are calling for an urgent inquiry into his conduct.
It comes as the government announced 282 more people had died with coronavirus since Friday, across all settings, bringing the total to 36,675.
Asked whether it looked good, he said: “Who cares about good looks? It’s a question of doing the right thing. It’s not about what you guys think.”
He was later asked by reporters whether he would consider his position, he said: “Obviously not.”
“You guys are probably all about as right about that as you were about Brexit: do you remember how right you all were about that,” he added.