Dominic Cummings had told aides that “working in government is hard” and that mental health problems should exclude someone from the job

A special adviser sacked after she confronted Dominic Cummings over his “unkindness” is understood to be considering suing the government.

Lynn Davidson, a former Sun journalist, lost her job this week, a fortnight after taking Mr Cummings to task for his treatment of staff.

Lynn Davidson was an adviser to the defence secretary, having worked at The Sun

Ms Davidson, 41, challenged Boris Johnson’s senior adviser on February 14 at a weekly meeting of ministerial aides claiming he had “picked on” aides to cabinet ministers who were due to be sacked.

She told Mr Cummings he had been “out of order” and he had to show more consideration to people, many fairly young, who were “doing their best in incredibly difficult circumstances”.

The following week he told aides he had reflected on the criticism but that working