NATO chief Jens Stoltenberg said Friday he had complete confidence in allies' sharing of sensitive intelligence, amid uproar over US President Donald Trump's reported disclosure of classified information.

"I very much appreciate the cooperation we have inside NATO on information sharing," Stoltenberg told reporters when asked about Trump's conduct.

"I trust all allies enough and I am absolutely certain that they are able to share and to handle this information in a good way," he added.