GAA President Liam O'Neill has criticised the "consistent negativity" of Tyrone manager Mickey Harte.

O'Neill has today defended the use of the new black card rule, despite criticism from several inter-county managers.

Harte complained about what he described as inconsistencies in the use of the new disciplinary measure after Down's Conor Maginn avoided a black card in the first-half of last Sunday's Ulster championship clash at Healy Park.

O'Neill has put the incident down to a mistake by the referee but has told Ocean FM of his disappointment with Harte.

"In fairness to Mickey Harte, he doesn't leave much negativity out. If there's something negative to be said, Mickey will say it and he's consistent on that," said the GAA chief.