I will never lie to you. You have my word on that.
Source, in full
Spoken to Associated Press reporter Jill Colvin, during McEnany's first press briefing as press secretary on 2020-05-01; quoted in “'I will never lie to you,' Trump's new Press Sec. Kayleigh McEnany lies” by Xeni Jardin (May 1, 2020), from BoingBoing.