The BBC Breakfast host reached out to the former One Direction star on Twitter to ask what had upset him.
The television presenter explained how trolls had gotten specific about "things [she'd] never thought of".
Twitter has warned that any further attempts to mislead the public on its platform during the election will lead to action.
It comes after the Prime Minister appeared to place his poppy wreath the wrong way round at the Cenotaph on Sunday.
The former 'BBC Breakfast' host admitted he would love to return to presenting and accepted an invitation to rejoin former colleague Susanna Reid.
The pregnant BBC presenter was praised for her performance, as well as her choice of jumper which took aim at Boris Johnson
The 57-year-old presenter demonstrated how she could have disappeared on screen in her green dress.
The 'Good Morning Britain' presenter took to Twitter to share his support for his 'breakfast rival'.