The UNAid's executive director, Winnie Byanyima, has lashed out at a Ugandan MP saying he lacks "the skills, competence & integrity of an MP".
MP Mwesigye Frank had accused the opposition leader Bobi Wine of double-speak using Ms Byanyima's photos.
The UN boss, who is a Ugandan national and married to politician Kizza Besigye, had met President Yoweri Museveni and later took a photo with Bobi Wine.
The MP shared her photos suggesting that she had met both leaders at the same venue.
Ms Byanyima clarified that she had first met the president and later in the day ran into the opposition leader at the airport.
Here is her tweet calling out the MP: