How did the "Telephone Gate" incident between Trump and Ukrainian President Zelensky break out?

Trump put pressure on Ukrainian President Zelensky by telephone, and threatened that the other party must stand on his side, help him crowd out former Vice President Biden in the presidential election, and investigate Biden. Later, this conversation was announced by the White House, and the recorded file was made public, so the telephone door incident broke out.

When talking to Zelensky on the phone, Trump tried to use the Ukrainian government to crowd out former Vice President Biden, the main rival of the presidential campaign. After the incident was exposed, American politics was in an uproar. Not long after, Democrat nancy pelosi, Speaker of the US House of Representatives, said that the House of Representatives had opened an impeachment investigation against Trump. It can be seen that Trump's behavior has had a great impact on the outside world, and many people have opinions on him.

When talking to Zelensky on the phone, Trump put pressure on Zelensky, threatened to detain military aid to Ukraine, and demanded eight times to investigate any misconduct of Biden and his son Hunter. Trump's behavior is really puzzling, and such a means is too unfair.

Ukrainian President and comedian Zelensky was caught in the center of public opinion because of the "Telephone Gate" incident with US President Trump. Trump's actions undermined the integrity of the election, the dignity of his position and national security. Trump tried to make lawlessness a virtue in the United States and is now exporting it abroad. As the president of a country, you should think carefully before doing anything. Don't be so frivolous, such behavior is very unpleasant. Many people will feel unfair and start impeaching Trump.