We have this pesky little document called The Constitution of the United States of America which clearly outlines how an impeachment is supposed to unfold.

#ThisAintHowItsDone
“Pelosi seems to believe that she can hold a press conference and expect courts to accept that a formal impeachment process has begun. Some judges are likely to be uncomfortable with such an immaculate impeachment,” he said.”
… “Never before in history has the Speaker of the House attempted to launch an ‘impeachment inquiry’ against a President without a majority of the House of Representatives voting to authorize a constitutionally acceptable process,” Morgan wrote on Tuesday.
Giuliani said on Tuesday that he wouldn’t comply with a congressional subpoena, lawyer Jon Sale said in a letter to the House Intelligence Committee.
“Mr. Giuliani will not participate because this appears to be an unconstitutional, baseless, and illegitimate ‘impeachment inquiry,’” Sale wrote.
Trump and his campaign have repeatedly hammered Pelosi for not holding a vote. The president said the inquiry is a coup attempt.”