The United States plans high-level talks with "Quad" security partners from India, Australia and Japan in September and October, President Donald Trump's national security adviser said Friday, while criticizing "very aggressive" behavior by China.

Robert O'Brien told the Atlantic Council think tank he would likely meet his opposite numbers from those countries in Hawaii in October, while Secretary of State Mike Pompeo would meet his counterparts from the so-called Quad in September and October.

O'Brien said the United States had an "amazing amount of stake" in the Indo-Pacific region.