As he wrote on his Twitter page, if this conversation is deemed inappropriate, then all future US presidents will no longer be able to communicate with foreign leaders over the phone.

“If this impeccable telephone conversation with the president of Ukraine is deemed inappropriate, then no future president will ever be able to speak again with another foreign leader!” He said.

If that perfect phone call with the President of Ukraine Isn't considered appropriate, then no future President can EVER again speak to another foreign leader!

- Donald J. Trump (@realDonaldTrump) September 27, 2019

Earlier, Trump said that there could not have been a more worthy conversation with Zelensky.

On September 25, the White House published a transcript of Trump's conversation with Zelensky. During the conversation, the President of Ukraine promised that the new Ukrainian Attorney General will study the situation with the son of former US Vice President Joe Biden.

U.S. House President Nancy Pelosi said the transcript could be the reason for impeachment trump.