The transcript of a July 25 call Trump made with the Ukrainian president in which he asked him to investigate the son of his political rival Joe Biden has become the subject of a Democratic-led impeachment inquiry into the president. (Photo: File)

Washington: US President Donald Trump said that on Thursday he would deliver on his promise to release the transcript of an April call with Ukrainian President Volodymyr Zelensky.

The transcript of a July 25 call Trump made with the Ukrainian president in which he asked him to investigate the son of his political rival Joe Biden has become the subject of a Democratic-led impeachment inquiry into the president.

Trump's critics accuse him of withholding almost USD 400 million in security aid to Ukraine as leverage to pressure Zelensky to publicly declare an investigation.