It's unknown what the Trump campaign officials who spoke with the ambassador – J.D. Gordon and Carter Page – discussed with him. Those who took part in the events in Cleveland said it is not unusual for presidential campaign teams to interact with diplomats.
However, the newly-revealed communications further contradict months of repeated denials by Trump officials that his campaign had contact with officials representing the Russian government.
http://www.usatoday.com/story/news/2017/03/02/exclusive-two-other-trump-advisers-also-spoke-russian-envoy-during-gop-convention/98648190/