Throughout their respective tenures presenting BBC Breakfast and Good Morning Britain, Dan and Piers were engaged in a mostly-playful public feud, which mostly centred around the latter’s hopes for the ITV show to overtake its rival in the ratings and their different presenting styles.
Article source: https://www.huffingtonpost.co.uk/entry/dan-walker-says-piers-morgan-crossed-a-line-feud-rivalry_uk_62adb63de4b0cdccbe5dfa41