Donald Trump Jr. arrives at Trump Tower in New York City. File picture: Stephanie Keith/Reuters

Washington - US President Donald Trump's eldest son on Tuesday released an email chain which refers to a top Russian government prosecutor as offering the Trump campaign damaging information about Democratic rival Hillary Clinton.

"The Crown prosecutor of Russia ... offered to provide the Trump campaign with some official documents and information that would incriminate Hillary and her dealings with Russia and would be very useful to your father," said the June 3, 2016, email to Donald Trump Jr. from publicist Rob Goldstone.

"This is obviously very high level and sensitive information but is part of Russia and its government's support for Mr. Trump," according to the email posted by Trump Jr. on Twitter.