When receiving The Spectator magazine's Parliamentarian of the Year award in November 2014, Mordaunt said that she had delivered a speech in the House of Commons just before the Easter recess in 2013 on poultry welfare so as to use the word "cock", as a forfeit for a misdemeanour during Naval Reserve training. Mordaunt used the word "cock" six times and "lay" or "laid" five times. Following her comments, she was accused by Labour MP Kate Hoey of trivialising parliament.
In 2014, Mordaunt appeared on reality television programme Splash!. Although some[who?] criticised the media appearance, in terms of questioning whether her focus should have been on her constituency work, Mordaunt stated that the response was overwhelmingly positive and defended her appearance.
On 1 May 2019, Mordaunt was appointed as the first ever female Defence Secretary.