The White House has released details of a phone call between President Trump and his Ukrainian counterpart that has triggered a US impeachment inquiry.
It shows Mr Trump asked Volodymyr Zelensky on 25 July to investigate Democratic candidate Joe Biden, whose son worked for a Ukrainian gas firm.
Mr Trump denies withholding US military aid to Ukraine as leverage in a bid to smear his political rival, Mr Biden.
The Trump-Ukraine phone call is part of a whistleblower’s complaint.
Reacting to the controversy on Wednesday morning at the United Nations General Assembly in New York City, Mr Trump said it was the “single greatest witch hunt in American history”.