Here’s how the whistleblower complaint that the Trump administration tried to keep out of the hands of Congress begins:
In the course of my official duties, I have received information from multiple U.S. Government officials that the President of the United States is using the power of his office to solicit interference from a foreign country in the 2020 U.S. election. This interference includes, among other things, pressuring a foreign country to investigate one of the President’s main domestic political rivals. The President’s personal lawyer, Mr. Rudolph Giuliani, is a central figure in this effort. Attorney General Barr appears to be involved as well.
No wonder they wanted to hide it.
You can read the now-declassified complaint here.